序号 |
内容 |
是否明白 |
备注 |
|
数组 |
|
|
1. |
数组去重(1) |
是 |
time:2019/04/09 |
2. |
数组去重(2) |
是 |
time:2019/04/09 |
3. |
数组去重(3)es6 |
是 |
time:2019/04/10 |
4. |
判断两个数组是否相等 |
是 |
time:2019/04/09 |
数组
1.数组去重(1)
/**
* 数组去重
* @param {Array}arr is
* @returns {*} is
*/
function arrayClear(arr) {
const arr2 = [];
if (arr instanceof Array) {
for (let i = 0, len = arr.length; i < len; i++) {
if (arr2.indexOf(arr[i]) < 0) {
arr2.push(arr[i]);
}
}
return arr2;
}
return false;
}
module.exports = arrayClear;
2.数组去重(2)
/**
* @desc 最简单数组去重法
* @param {Array} arr is
* @return {Boolean} is
*/
function arrayUnique(arr) {
const n = [];
for (let i = 0; i < arr.length; i++) {
if (n.indexOf(arr[i]) === -1) n.push(arr[i]);
}
return n;
}
module.exports = arrayUnique;
3.数组去重(3)es6
/**
* @desc es6数组去重法
* @param {Array} arr is
* @return {Boolean} is
*/
function arraySet(arr) {
let set = new Set(arr);
return set;
}
module.exports = arrayUnique;
4.判断两个数组是否相等
/**
*
* @desc 判断两个数组是否相等
* @param {Array} arr1 is
* @param {Array} arr2 is
* @return {Boolean} is
*/
function arrayEqual(arr1, arr2) {
if (arr1 === arr2) return true;
if (arr1.length !== arr2.length) return false;
for (let i = 0; i < arr1.length; ++i) {
if (arr1[i] !== arr2[i]) return false;
}
return true;
}
module.exports = arrayEqual;