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,

2. 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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