Array
Overview
The javascript Array implementation. It is a collection of items kept by index, providing typical array API. The index is a integer (>= 0) or a string representing such an integer.
For more information see: Array (MDN).
Properties Summarized
Methods Summarized
Takes an integer value and returns the item at that index, allowing for positive and negative integers.
Returns a new array comprised of this array joined with other array(s) and/or value(s).
Returns a new array comprised of this array joined with other array(s) and/or value(s).
Returns a new array comprised of this array joined with other array(s) and/or value(s).
Shallow copies part of an array to another location in the same array and returns it without modifying its length
Shallow copies part of an array to another location in the same array and returns it without modifying its length
Shallow copies part of an array to another location in the same array and returns it without modifying its length
The entries() method of Array instances returns a new array iterator object that contains the key/value pairs for each index in the array.
Runs a function on items in the array while that function is returning true.
Changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.
Changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.
Changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.
Runs a function on every item in the array and returns an array of all items for which the function returns true.
Runs a function on every item in the array and returns an array of all items for which the function returns true.
Returns the value of the first element in the provided array that satisfies the provided testing function.
Returns the index of the first element in the provided array which satisfies the provided testing function.
Iterates the array in reverse order and returns the value of the first element that satisfies the provided testing function.
Iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function.
The flat() method of Array instances creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.
The flat() method of Array instances creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.
The flatMap() method of Array instances returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level.
The flatMap() method of Array instances returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level.
Creates a new, shallow-copied Array instance from an iterable or array-like object.
Determines whether an array includes a certain value among its entries, returning true or false as appropriate.
Determines whether an array includes a certain value among its entries, returning true or false as appropriate.
Returns the first index at which a given element can be found in the array, or -1 if it is not present.
Returns the first index at which a given element can be found in the array, or -1 if it is not present.
Puts all elements in the array into a string, separating each element with the specified delimiter
It is the copying version of using the bracket notation to change the value of a given index.
The keys() method of Array instances returns a new array iterator object that contains the keys for each index in the array.
Returns the last index at which a given element can be found in the array, or -1 if it is not present.
Returns the last index at which a given element can be found in the array, or -1 if it is not present.
Runs a function on every item in the array and returns the results in an array.
Mutates an array by appending the given elements and returning the new length of the array.
Mutates an array by appending the given elements and returning the new length of the array.
Mutates an array by appending the given elements and returning the new length of the array.
Reduces the array to a single value by executing a provided function for each value of the array (from left-to-right).
The reduceRight() method of Array instances applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value.
The reduceRight() method of Array instances applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value.
Decreases array element size by one by shifting the first element off the array and returning it.
Runs a function on items in the array while that function returns false.
Sorts the array elements in dictionary order or using a compare function passed to the method.
Sorts the array elements in dictionary order or using a compare function passed to the method.
It is used to take elements out of an array and replace them with those specified.
It is used to take elements out of an array and replace them with those specified.
It is used to take elements out of an array and replace them with those specified.
It is used to take elements out of an array and replace them with those specified.
The toReversed() method transposes the elements of the calling array object in reverse order and returns a new array.
Properties Detailed
[index]
Get an element by index.
Type Object
Sample
array[0]length
Get the length of the array.
Type Number
Sample
array.lengthMethods Detailed
at(index)
Takes an integer value and returns the item at that index, allowing for positive and negative integers. Negative integers count back from the last item in the array.
Parameters
Number index ;
Returns: Array The element in the array matching the given index.
Sample
const arr = [1, 2, 3, 4, 5];
application.output(arr.at(2));concat(value1)
Returns a new array comprised of this array joined with other array(s) and/or value(s).
Parameters
Object value1 ;
Returns: Array
Sample
array.concat();concat(value1, value2)
Returns a new array comprised of this array joined with other array(s) and/or value(s).
Parameters
Returns: Array
Sample
array.concat();concat(value1, value2, valueN)
Returns a new array comprised of this array joined with other array(s) and/or value(s).
Parameters
Returns: Array
Sample
array.concat();copyWithin(target)
Shallow copies part of an array to another location in the same array and returns it without modifying its length
Parameters
Number target Zero-based index at which to copy the sequence to. If negative, target will be counted from the end.
Returns: Array
Sample
array.copyWithin(2);copyWithin(target, start)
Shallow copies part of an array to another location in the same array and returns it without modifying its length
Parameters
Number target Zero-based index at which to copy the sequence to. If negative, target will be counted from the end.
Number start Zero-based index at which to start copying elements from. If negative, start will be counted from the end. If start is omitted, copyWithin will copy from index 0.
Returns: Array
Sample
array.copyWithin(2);copyWithin(target, start, end)
Shallow copies part of an array to another location in the same array and returns it without modifying its length
Parameters
Number target Zero-based index at which to copy the sequence to. If negative, target will be counted from the end.
Number start Zero-based index at which to start copying elements from. If negative, start will be counted from the end. If start is omitted, copyWithin will copy from index 0.
Number end Zero-based index at which to end copying elements from. copyWithin copies up to but not including end. If negative, end will be counted from the end.
Returns: Array
Sample
array.copyWithin(2);entries()
The entries() method of Array instances returns a new array iterator object that contains the key/value pairs for each index in the array.
Returns: Iterator the iterator
Sample
const arr = [1, 2, 3, 4, 5];
const iterator = arr.entries();every(callback)
Runs a function on items in the array while that function is returning true. It returns true if the function returns true for every item it could visit. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Function callback ;
Returns: Boolean
Sample
function isNumber(value) { return typeof value == 'number'; }
var a1 = [1, 2, 3];
application.output(a1.every(isNumber));
var a2 = [1, '2', 3];
application.output(a2.every(isNumber));every(callback, thisObject)
Runs a function on items in the array while that function is returning true. It returns true if the function returns true for every item it could visit. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Returns: Boolean
Sample
function isNumber(value) { return typeof value == 'number'; }
var a1 = [1, 2, 3];
application.output(a1.every(isNumber));
var a2 = [1, '2', 3];
application.output(a2.every(isNumber));fill(value)
Changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.length). It returns the modified array.
Parameters
Object value Value to fill the array with.
Returns: Array
Sample
array.fill('test');fill(value, start)
Changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.length). It returns the modified array.
Parameters
Returns: Array
Sample
array.fill('test');fill(value, start, end)
Changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.length). It returns the modified array.
Parameters
Object value Value to fill the array with.
Number start Zero-based index at which to start filling.
Number end Zero-based index at which to end filling.
Returns: Array
Sample
array.fill('test');filter(callback)
Runs a function on every item in the array and returns an array of all items for which the function returns true. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Function callback ;
Returns: Array
Sample
var a1 = ['a', 10, 'b', 20, 'c', 30];
var a2 = a1.filter(function(item) { return typeof item == 'number'; });
application.output(a2);filter(callback, thisObject)
Runs a function on every item in the array and returns an array of all items for which the function returns true. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Returns: Array
Sample
var a1 = ['a', 10, 'b', 20, 'c', 30];
var a2 = a1.filter(function(item) { return typeof item == 'number'; });
application.output(a2);find(callback)
Returns the value of the first element in the provided array that satisfies the provided testing function. If no values satisfy the testing function, undefined is returned. The callback function can invoked with three arguments: the element value, the element index(optional), the array being traversed (optional).
Parameters
Function callback a testing function
Returns: Object the element which satisfies the function or undefined
Sample
var array1 = [5, 12, 8, 130, 44];
var found = array1.find(function(element) { return element > 10});
application.output(found); // prints 12findIndex(callback)
Returns the index of the first element in the provided array which satisfies the provided testing function. If no values satisfy the testing function, -1 is returned. The callback function can invoked with three arguments: the element value, the element index (optional), the array being traversed (optional).
Parameters
Function callback a testing function
Returns: Number the index of the first element which satisfies the function or -1
Sample
var array1 = [5, 12, 8, 130, 44];
var found = array1.findIndex(function(element) { return element > 10});
application.output(found); // prints 1findLast(callback)
Iterates the array in reverse order and returns the value of the first element that satisfies the provided testing function. If no elements satisfy the testing function, undefined is returned. The callback function can invoked with three arguments: the element value, the element index (optional), the array being traversed (optional).
Parameters
Function callback a testing function
Returns: Object the index of the first element which satisfies the function or undefined
Sample
const array1 = [5, 12, 50, 130, 44];
const found = array1.findLast((element) => element > 45);
application.output(found); // prints 130findLastIndex(callback)
Iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned. The callback function can invoked with three arguments: the element value, the element index (optional), the array being traversed (optional).
Parameters
Function callback a testing function
Returns: Object the index of the first element which satisfies the function or undefined
Sample
const array1 = [5, 12, 50, 130, 44];
const found = array1.findLast((element) => element > 45);
application.output(found); // prints 3flat()
The flat() method of Array instances creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. Default depth is 1.
Returns: Array new flat array
Sample
const arr1 = [0, 1, 2, [3, 4]];
const newarr = arr.flat();flat(depth)
The flat() method of Array instances creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.
Parameters
Number depth The depth level specifying how deep a nested array structure should be flattened. Defaults to 1.
Returns: Array new flat array
Sample
const arr1 = [0, 1, 2, [3, 4, 5, [6, 7]]];
const newarr = arr.flat(2);flatMap(callback)
The flatMap() method of Array instances returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level. It is identical to a map() followed by a flat() of depth 1, but slightly more efficient than calling those two methods separately.
Parameters
Function callback ``` A function that produces an element of the new Array, taking three arguments: - element The current element being processed in the array. - index The index of the current element being processed in the array. - array The array flatMap() was called upon.
**Returns:** [Boolean](./boolean.md)
**Sample**
```js
const arr1 = [1, 2, 1];
const result = arr1.flatMap((num) => (num === 2 ? [2, 2] : 1));flatMap(callback, thisObject)
The flatMap() method of Array instances returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level. It is identical to a map() followed by a flat() of depth 1, but slightly more efficient than calling those two methods separately.
Parameters
Function callback ``` A function that produces an element of the new Array, taking three arguments: - element The current element being processed in the array. - index The index of the current element being processed in the array. - array The array flatMap() was called upon.
* [Array](./array.md) **thisObject** value to use as this when executing callback
**Returns:** [Boolean](./boolean.md)
**Sample**
```js
const arr1 = [1, 2, 1];
const result = arr1.flatMap((num) => (num === 2 ? [2, 2] : 1));forEach(callback)
Runs a function (callback) on every item in the array. The callback function is invoked only for indexes of the array which have assigned values. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Function callback ;
Returns: void
Sample
function printThemOut(element, index, array) {
application.output("a[" + index + "] = " + element);
}
var a = ['a', 'b', 'c'];
a.forEach(printThemOut);forEach(callback, thisObject)
Runs a function (callback) on every item in the array. The callback function is invoked only for indexes of the array which have assigned values. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Returns: void
Sample
function printThemOut(element, index, array) {
application.output("a[" + index + "] = " + element);
}
var a = ['a', 'b', 'c'];
a.forEach(printThemOut);from(value)
Creates a new, shallow-copied Array instance from an iterable or array-like object.
Parameters
Object value An iterable or array-like object to convert to an array.
Returns: Array
Sample
var a = Array.from([1, 2, 3]);from(value, mapFunction, thisObject)
Creates a new, shallow-copied Array instance from an iterable or array-like object.
Parameters
Object value An iterable or array-like object to convert to an array.
Function mapFunction Map function to call on every element of the array. If provided, every value to be added to the array is first passed through this function, and mapFunction's return value is added to the array instead.
Object thisObject Value to use as this when executing mapFunction.
Returns: Array
Sample
var a = Array.from([1, 2, 3]);includes(searchElement)
Determines whether an array includes a certain value among its entries, returning true or false as appropriate.
Parameters
Object searchElement The value to search for.
Returns: Boolean
Sample
array.includes('test');includes(searchElement, start)
Determines whether an array includes a certain value among its entries, returning true or false as appropriate.
Parameters
Object searchElement The value to search for.
Number start Zero-based index at which to start searching.
Returns: Boolean
Sample
array.includes('test');indexOf(searchElement)
Returns the first index at which a given element can be found in the array, or -1 if it is not present.
Parameters
Object searchElement ;
Returns: Number
Sample
var a = ['a', 'b', 'a', 'b', 'a'];
application.output(a.indexOf('b'));
application.output(a.indexOf('b', 2));
application.output(a.indexOf('z'));indexOf(searchElement, fromIndex)
Returns the first index at which a given element can be found in the array, or -1 if it is not present.
Parameters
Returns: Number
Sample
var a = ['a', 'b', 'a', 'b', 'a'];
application.output(a.indexOf('b'));
application.output(a.indexOf('b', 2));
application.output(a.indexOf('z'));isArray(obj)
Checks whether an object is an array or not.
Parameters
Object obj ;
Returns: Boolean
Sample
var a = [1, 2, 3];
application.output(Array.isArray(a)); //prints true
application.output(Array.isArray(23)); //prints falsejoin(delimiter)
Puts all elements in the array into a string, separating each element with the specified delimiter
Parameters
String delimiter ;
Returns: String
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var jwords = words.join(";");js_with(index, value)
It is the copying version of using the bracket notation to change the value of a given index.
Parameters
Returns: Array a new array with the element at the given index replaced with the given value.
Sample
const arr = [1, 2, 3, 4, 5];
application.output(arr.with(2, 6)); // [1, 2, 6, 4, 5]keys()
The keys() method of Array instances returns a new array iterator object that contains the keys for each index in the array.
Returns: Iterator the iterator
Sample
const arr = [1, 2, 3, 4, 5];
const iterator = arr.keys();lastIndexOf(searchElement)
Returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.
Parameters
Object searchElement ;
Returns: Number
Sample
var a = ['a', 'b', 'c', 'd', 'a', 'b'];
application.output(a.lastIndexOf('b'));
application.output(a.lastIndexOf('b', 4));
application.output(a.lastIndexOf('z'));lastIndexOf(searchElement, fromIndex)
Returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.
Parameters
Returns: Number
Sample
var a = ['a', 'b', 'c', 'd', 'a', 'b'];
application.output(a.lastIndexOf('b'));
application.output(a.lastIndexOf('b', 4));
application.output(a.lastIndexOf('z'));map(callback)
Runs a function on every item in the array and returns the results in an array. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Object callback ;
Returns: Array
Sample
var a = ['a', 'b', 'c'];
var a2 = a.map(function(item) { return item.toUpperCase(); });
application.output(a2);map(callback, thisObject)
Runs a function on every item in the array and returns the results in an array. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Returns: Array
Sample
var a = ['a', 'b', 'c'];
var a2 = a.map(function(item) { return item.toUpperCase(); });
application.output(a2);of(value)
Ccreates a new Array instance from a variable number of arguments.
Parameters
Array value ;
Returns: Array
Sample
var a = Array.of(1, 2, 3);pop()
Pops the last string off the array and returns it.
Returns: Object
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var lastword = words.pop();push(value1)
Mutates an array by appending the given elements and returning the new length of the array.
Parameters
Object value1 ;
Returns: Number
Sample
var words = new Array("limit","lines","finish","complete");
words.push("In","Out");push(value1, value2)
Mutates an array by appending the given elements and returning the new length of the array.
Parameters
Returns: Number
Sample
var words = new Array("limit","lines","finish","complete");
words.push("In","Out");push(value1, value2, valueN)
Mutates an array by appending the given elements and returning the new length of the array.
Parameters
Returns: Number
Sample
var words = new Array("limit","lines","finish","complete");
words.push("In","Out");reduce(f, initialValue)
Reduces the array to a single value by executing a provided function for each value of the array (from left-to-right).
Parameters
Function f Function to execute on each element in the array, taking four arguments: -accumulator: accumulates the callback's return values; it is the accumulated value previously returned in the last invocation of the callback, or initialValue, if supplied (see below). -currentValue: the current element being processed in the array. -currentIndex (Optional): the index of the current element being processed in the array (starts at index 0, if an initialValue is provided, and at index 1 otherwise) -array (Optional): the array reduce() was called upon.
Object initialValue Value to use as the first argument to the first call of the callback. If no initial value is supplied, the first element in the array will be used.
Returns: Object Object
Sample
var euros = [29.76, 41.85, 46.5];
var sum = euros.reduce( function(total, amount) {
return total + amount
});reduceRight(f)
The reduceRight() method of Array instances applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value. See also reduce() for left-to-right processing.
Parameters
Function f Function to execute on each element in the array, taking four arguments: -accumulator: accumulates the callback's return values; it is the accumulated value previously returned in the last invocation of the callback, or initialValue, if supplied (see below). -currentValue: the current element being processed in the array. -currentIndex: the index of the current element being processed in the array (starts at index 0, if an initialValue is provided, and at index 1 otherwise) -array : the array reduce() was called upon.
Returns: Object Object The value that results from the reduction.
Sample
var euros = [29.76, 41.85, 46.5];
var sum = euros.reduceRight( function(total, amount) {
return total + amount
});reduceRight(f, initialValue)
The reduceRight() method of Array instances applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value. See also reduce() for left-to-right processing.
Parameters
Function f Function to execute on each element in the array, taking four arguments: -accumulator: accumulates the callback's return values; it is the accumulated value previously returned in the last invocation of the callback, or initialValue, if supplied (see below). -currentValue: the current element being processed in the array. -currentIndex: the index of the current element being processed in the array (starts at index 0, if an initialValue is provided, and at index 1 otherwise) -array : the array reduce() was called upon.
Object initialValue Value to use as the first argument to the first call of the callback. If no initial value is supplied, the first element in the array will be used.
Returns: Object Object The value that results from the reduction.
Sample
var euros = [29.76, 41.85, 46.5];
var sum = euros.reduceRight( function(total, amount) {
return total + amount
});reverse()
Puts array elements in reverse order.
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
words.reverse();shift()
Decreases array element size by one by shifting the first element off the array and returning it.
Returns: Object
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
words.shift();slice(begin)
The slice method creates a new array from a selected section of an array.
Parameters
Object begin ;
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var nwords1 = words.slice(3, 5);slice(begin, end)
The slice method creates a new array from a selected section of an array.
Parameters
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var nwords1 = words.slice(3, 5);some(callback)
Runs a function on items in the array while that function returns false. It returns true if the function returns true for any item it could visit. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Function callback ;
Returns: Boolean
Sample
function isNumber(value) { return typeof value == 'number'; }
var a1 = [1, 2, 3];
application.output(a1.some(isNumber));
var a2 = [1, '2', 3];
application.output(a2.some(isNumber));some(callback, thisObject)
Runs a function on items in the array while that function returns false. It returns true if the function returns true for any item it could visit. The callback function is invoked with three arguments: the element value, the element index, the array being traversed.
Parameters
Returns: Boolean
Sample
function isNumber(value) { return typeof value == 'number'; }
var a1 = [1, 2, 3];
application.output(a1.some(isNumber));
var a2 = [1, '2', 3];
application.output(a2.some(isNumber));sort()
Sorts the array elements in dictionary order or using a compare function passed to the method.
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
words.sort();sort(function)
Sorts the array elements in dictionary order or using a compare function passed to the method.
Parameters
Function function ;
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
words.sort();splice(arrayIndex, length)
It is used to take elements out of an array and replace them with those specified.
Parameters
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var nwords1 = words.splice(3, 2, "done", "On");splice(arrayIndex, length, value1)
It is used to take elements out of an array and replace them with those specified.
Parameters
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var nwords1 = words.splice(3, 2, "done", "On");splice(arrayIndex, length, value1, value2)
It is used to take elements out of an array and replace them with those specified.
Parameters
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var nwords1 = words.splice(3, 2, "done", "On");splice(arrayIndex, length, value1, value2, valueN)
It is used to take elements out of an array and replace them with those specified.
Parameters
Returns: Array
Sample
var words = new Array("limit","lines","finish","complete","In","Out");
var nwords1 = words.splice(3, 2, "done", "On");toReversed()
The toReversed() method transposes the elements of the calling array object in reverse order and returns a new array. When used on sparse arrays, the toReversed() method iterates empty slots as if they have the value undefined.
Returns: Array a new array containing the elements in reversed order
Sample
const items = [1, 2, 3];
application.output(items); // [1, 2, 3]
const reversedItems = items.toReversed();
application.output(reversedItems); // [3, 2, 1]toSorted()
It is the copying version of the sort() method. It returns a new array with the elements sorted in ascending order. The array elements are converted to strings, then sorted according to each character's Unicode code point value. When used on sparse arrays, the toSorted() method iterates empty slots as if they have the value undefined.
Returns: Array a new array containing the elements sorted in ascending order
Sample
const months = ["Mar", "Jan", "Feb", "Dec"];
const sortedMonths = months.toSorted();
application.output(sortedMonths); // ['Dec', 'Feb', 'Jan', 'Mar']toSorted(comparator)
It is the copying version of the sort() method. It returns a new array with the elements sorted in ascending order. When used on sparse arrays, the toSorted() method iterates empty slots as if they have the value undefined.
Parameters
Function comparator a comparator function
Returns: Array a new array containing the elements sorted in ascending order
Sample
const values = [1, 10, 21, 2];
const sortedValues = values.toSorted((a, b) => a - b);
application.output(sortedValues); // [1, 2, 10, 21]toSpliced(start)
It is the copying version of the splice() method. It returns a new array with some elements removed and/or replaced at a given index.
Parameters
Object start ;
Returns: Array a new array that consists of all elements before start
Sample
const months = ["Jan", "Mar", "Apr", "May"];
const months2 = months.toSpliced(2);
application.output(months2); // ["Jan", "Mar"]toSpliced(start, deleteCount)
It is the copying version of the splice() method. It returns a new array with some elements removed and/or replaced at a given index.
Parameters
Returns: Array a new array that consists of all elements before start and all elements after start + deleteCount.
Sample
const months = ["Jan", "Mar", "Apr", "May"];
const months2 = months.toSpliced(2, 2);
application.output(months2); // ["Jan", "Mar", "May"]toSpliced(start, deleteCount, item1)
It is the copying version of the splice() method. It returns a new array with some elements removed and/or replaced at a given index.
Parameters
Returns: Array a new array that consists of all elements before start, adds item1 to the array (beginning from start) and all elements after start + deleteCount.
Sample
const months = ["Jan", "Mar", "Apr", "May"];
const months2 = months.toSpliced(1, 0, "Feb");
application.output(months2); // ["Jan", "Feb", "Mar", "Apr", "May"]toSpliced(start, deleteCount, items)
It is the copying version of the splice() method. It returns a new array with some elements removed and/or replaced at a given index.
Parameters
Returns: Array a new array that consists of all elements before start, adds items to the array (beginning from start) and all elements after start + deleteCount.
Sample
const months = ["Jan", "Feb", "May"];
const months2 = months.toSpliced(1, 1, "Feb", "Mar");
application.output(months2); // ["Jan", "Feb", "Mar", "May"]unshift(value1, value2, valueN)
Places element data at the start of an array.
Parameters
Returns: Number
Sample
var words = new Array("finish","complete","In","Out");
words.unshift("limit","lines");values()
The values() method of Array instances returns a new array iterator object that iterates the value of each item in the array.
Returns: Iterator the iterator
Sample
const arr = [1, 2, 3, 4, 5];
const iterator = arr.values();Last updated
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