JavaScript Array some() Method

The Array.some() method is a built-in JavaScript function that tests whether at least one element in an array passes a provided test implemented by a callback function. It stops execution and returns true when it finds an element that satisfies the condition, making it efficient for use cases where partial matches are sufficient.

Syntax

arr.some(callback(element, index, array), thisArg);

Parameters

Parameter	Description
callback	(Required) A function to test each element of the array.
element	(Required in callback) The current element being processed.
index	(Optional in callback) The index of the current element being processed.
array	(Optional in callback) The array some() was called on.
thisArg	(Optional) A value to use as this when executing the callback function. Defaults to undefined.

Return Value

The some() method returns:

• true if at least one element in the array satisfies the test condition.
• false if no elements satisfy the test condition.

Example 1: Checking for a Positive Number

let arr = [-10, -20, 5, -30];

let hasPositive = arr.some(num => num > 0);
console.log(hasPositive); // Output: true

Example 2: Testing for Even Numbers

let arr = [1, 3, 5, 7, 8];

let hasEven = arr.some(num => num % 2 === 0);
console.log(hasEven); // Output: true

Example 3: Using some() with Strings

let arr = ['HTML', 'CSS', 'JavaScript', 'jQuery'];

let hasExist = arr.some(item => item === 'JavaScript');
console.log(hasExist); // Output: true

Example 4: Using some() with Objects

let users = [
    { name: 'John', age: 25 },
    { name: 'Alice', age: 30 },
    { name: 'Bob', age: 20 }
];

let hasAdult = users.some(user => user.age >= 18);
console.log(hasAdult); // Output: true

Example 5: Using thisArg Parameter

let arr = [10, 20, 30];
let context = { threshold: 25 };

let result = arr.some(function(item) {
    return item > this.threshold;
}, context);

console.log(result); // Output: true

Example 6: Checking for Undefined Values

let data = [1, undefined, 3];

let hasUndefined = data.some(value => value === undefined);
console.log(hasUndefined); // Output: true

Supported Browsers

Browser	Support
Chrome	1+
Firefox	1.5+
Safari	3+
Edge	12+
Opera	10.5+
Internet Explorer	9+