Function: filter()

function filter<T>(collection, callback): T;

Filters elements of an array or object based on a callback function. 根据回调函数过滤数组或对象的元素。

Type Parameters

Type Parameter
T extends unknown[] | Record<string, unknown>

Parameters

Parameter	Type	Description
collection	T	The array or object to filter / 要过滤的数组或对象
callback	(value, indexOrKey, collection) => boolean	The function to call for each element / 为每个元素调用的函数

Returns

T

A new array or object with filtered elements / 包含过滤元素的新数组或对象

Example

// Array filtering
const numbers = [1, 2, 3, 4, 5]
const evenNumbers = filter(numbers, (num) => num % 2 === 0)
evenNumbers // => [2, 4]

const users = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 17 },
  { name: 'Charlie', age: 30 }
]
const adults = filter(users, (user) => user.age >= 18)
adults // => [{ name: 'Alice', age: 25 }, { name: 'Charlie', age: 30 }]

// Object filtering
const obj = { a: 1, b: 2, c: 3, d: 4, e: 5 }
const evenValues = filter(obj, (value) => value % 2 === 0)
evenValues // => { b: 2, d: 4 }

const config = { debug: true, timeout: 5000, retries: 3, verbose: false }
const booleanSettings = filter(config, (value) => typeof value === 'boolean')
booleanSettings // => { debug: true, verbose: false }

Since

1.0.0