javascript change array length methods

javascript change array length methods

Array

1. 改变数组长度的方法

push, pop

shift, unshift,

splice,

fill,

1. 不改变数组长度的方法

map, forEach,

filter,

reduce, reduceRight,

some, every,

indexOf, lastIndexOf,

sort, reverse,

join,

includes,

concat,

entries, keys, values,

toString, toLocaleString,

find, findIndex,

flat

flatMap

copyWithin,

Array.from

Array.of

Array.isArray

Array.fill 改变数组长度

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill

// fill 填充
arr.fill(value[, start[, end]])

Array.splice 改变数组长度

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

// splice 拼接
let arrDeletedItems = array.splice(start[, deleteCount[, item1[, item2[, ...]]]])

Array.slice 不改变数组长度

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice

// slice 切片

// string.slice(beginIndex[, endIndex])
array.slice([start[, end]])

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat

refs

https://javascript.info/array-methods

https://javascript.info/array

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