Set

`Set.prototype.clear`

Removes all elements from a Set object

Syntax

JavaScript

set.clear()

Return Value

undefined

Examples

Basic Usage

const set = new Set([1, 2, 3, 4, 5]);
console.log(set.size); // 5
set.clear();
console.log(set.size); // 0

Practical Example

const selection = new Set<string>();
selection.add('item1');
selection.add('item2');
function clearSelection() {
  selection.clear();
  console.log('Selection cleared');
}

Advanced Usage

const set = new Set(['x']);
set.clear();
console.log(set.has('x')); // false

Understanding Set.prototype.clear

The Set.prototype.clear method in JavaScript removes all elements from a Set object. It belongs to the Set object and is one of the most widely used methods for working with set values in modern JavaScript and TypeScript applications.

The method signature is set.clear(). When called, it returns undefined. Understanding when and how to use clear() helps you write more expressive, readable code.

Common use cases for Set.prototype.clear include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like set-delete, set-add, map-clear, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for Set.prototype.clear is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.