some

INFO

This function is only available in es-toolkit/compat for compatibility reasons. It either has alternative native JavaScript APIs or isn’t fully optimized yet.

When imported from es-toolkit/compat, it behaves exactly like lodash and provides the same functionalities, as detailed here.

Checks if there is an element in an array or object that matches the given predicate.

You can specify the condition in several ways:

• Predicate function: If you provide a predicate function, the function will be applied to each item. The first item that makes the predicate function return true will be selected.
• Partial object: If you provide a partial object, the function will return the first item that matches the properties of the partial object.
• Property-value pair: If you provide a property-value pair, the function will return the first item that matches the property and value from the pair.
• Property name: If you provide a property name, the function will return the first item where the specified property has a truthy value.

If no predicate is provided, the function checks if there is any truthy element in the array or object.

Signature

function some<T>(arr: T[]): boolean;
function some<T>(arr: T[], predicate: (item: T, index: number, arr: any) => unknown): boolean;
function some<T>(arr: T[], predicate: [keyof T, unknown]): boolean;
function some<T>(arr: T[], predicate: string): boolean;
function some<T>(arr: T[], predicate: Partial<T>): boolean;

function some<T extends Record<string, unknown>>(object: T): boolean;
function some<T extends Record<string, unknown>>(
  object: T,
  predicate: (value: T[keyof T], key: keyof T, object: T) => unknown
): boolean;
function some<T extends Record<string, unknown>>(object: T, predicate: Partial<T[keyof T]>): boolean;
function some<T extends Record<string, unknown>>(object: T, predicate: [keyof T[keyof T], unknown]): boolean;
function some<T extends Record<string, unknown>>(object: T, predicate: string): boolean;

Parameters

• arr (T[]) or object (T): The array or object to iterate over.

arr can be ArrayLike<T>, null, or undefined

To ensure full compatibility with lodash, the some function handles arr in this way:

• If arr is an ArrayLike<T>, it gets converted into an array using Array.from(...).
• If arr is null or undefined, it will be treated as an empty array.

object can be null or undefined

To ensure full compatibility with lodash, the some function handles object in this way:

• If object is null or undefined, it will be converted into an empty object.

• predicate:

  • For the some overload with arrays:

    • Predicate function ((item: T, index: number, arr: T[]) => unknown): A function that takes an item, its index, and the array, and returns a truthy value if the item matches the criteria.
    • Partial object (Partial<T>): A partial object that specifies the properties to match.
    • Property-value pair ([keyof T, unknown]): An array where the first element is the property key and the second element is the value to match.
    • Property name (string): The name of the property to check for a truthy value.

  • For the some overloads with objects:

    • Predicate function ((value: T[keyof T], key: keyof T, object: T) => unknown): A function that takes an value, its key, and the object, and returns a truthy value if the item matches the criteria.
    • Partial value (Partial<T[keyof T]>): A partial value to match against the values of the object.
    • Property-value pair ([keyof T[keyof T], unknown]): An array where the first element is the property key and the second element is the value to match.
    • Property name (string): The name of the property to check for a truthy value.

Returns

(boolean): Returns true if any element passes the predicate check, else false.

Examples

Arrays

import { some } from 'es-toolkit/compat';

// Using a predicate function
let items = [1, 2, 3, 4, 5];
let result = some(items, item => item > 3);
console.log(result); // true

// Using a partial object
items = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
];
result = some(items, { name: 'Bob' });
console.log(result); // true

// Using a property-value pair
items = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
];
result = some(items, ['name', 'Bob']);
console.log(result); // true

// Using a property name
items = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
];
result = some(items, 'name');
console.log(result); // true

Objects

import { some } from 'es-toolkit/compat';

// Using a predicate function
let obj = { a: 1, b: 2, c: 3 };
let result = some(object, value => value > 2);
console.log(result); // true

// Using a partial value
obj = { a: { id: 1, name: 'Alice' }, b: { id: 2, name: 'Bob' } };
result = some(obj, { name: 'Bob' });
console.log(result); // true

// Using a property-value pair
obj = { alice: { id: 1, name: 'Alice' }, bob: { id: 2, name: 'Bob' } };
result = some(obj, ['name', 'Bob']);
console.log(result); // true

// Using a property name
obj = { a: { id: 1, name: 'Alice' }, b: { id: 2, name: 'Bob' } };
result = some(obj, 'name');
console.log(result); // true