> For the complete documentation index, see [llms.txt](https://docs.servoy.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.servoy.com/reference/servoycore/dev-api/js-lib/boolean.md).

# Boolean

## Overview

A **Boolean** is a data type that represents one of two values: `true` or `false`.

## Key Characteristics

1. **Basic Definition:**\
   A Boolean value is either `true` or `false`. These values are typically the result of comparison operations or logical expressions.
2. **Type Conversion:**\
   Any value in JavaScript can be converted to a Boolean using the `Boolean()` function or double negation `!!`. **Examples:**

   ```js
     Boolean(0); // false
     Boolean(1); // true
     
   ```

````
    
1. **Common Use Cases:**  
    **Conditionals:** Boolean values are essential in `if` statements to control the flow of a program\.
    ```js
      if (isAvailable) {
          console.log("The item is available!");
      }
      
````

````
**Logical Operators:** Boolean values work with operators like `&&`, `||`, and `!` for complex conditions\.
```js
  let result = isAvailable && isAffordable;
  
````

```
    
1. **Truthiness and Falsiness:**  
    Some values in JavaScript are inherently "truthy" \(treated as `true`\) or "falsy" \(treated as `false`\)\. **Falsy values** include: `false`, `0`, `""`, `null`, `undefined`, and `NaN`\.


---
```


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