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js工具库 封装常用的工具函数 如深拷贝 时间转换日期格式化、浏览器判断等，提高开发效率
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<h1 class="page-title">Source: obj/array/array.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* @Author: zhangyu
* @Email: zhangdulin@outlook.com
* @Date: 2021-06-25 11:30:34
* @LastEditors: zhangyu
* @LastEditTime: 2021-07-28 14:17:37
* @Description:
*/
import { isFunc } from '../../judgement/index'
/**
* @description: 数组转对象
* @param {string} key
* @param {any} arr
* @return {object}
*/
export function arrayToObject(key, arr) {
const mapping = {};
arr.forEach((item) => {
if (item[key]) {
mapping[item[key]] = item
}
})
return mapping
}
/**
* 引用数组位移，性能优化
* @param {*} array
* @param {number} from
* @param {number} to
*/
export function arrayMoveMutate(array, from, to) {
const startIndex = from < 0 ? array.length + from : from;
if (startIndex >= 0 && startIndex < array.length) {
const endIndex = to < 0 ? array.length + to : to;
const [item] = array.splice(from, 1);
array.splice(endIndex, 0, item);
}
}
/**
* 数组位移
* @param {array} array
* @param {number} from
* @param {number} to
* @return {*}
* @example
```
const { arrayMove } = require('@alrale/common-lib');
const input = ['a', 'b', 'c'];
const array1 = arrayMove(input, 1, 2);
console.log(array1);
//=> ['a', 'c', 'b']
const array2 = arrayMove(input, -1, 0);
console.log(array2);
//=> ['c', 'a', 'b']
const array3 = arrayMove(input, -2, -3);
console.log(array3);
//=> ['b', 'a', 'c']
```
*/
export function arrayMove(array, from, to) {
const _array = [...array];
arrayMoveMutate(_array, from, to);
return _array;
}
/**
* 按条件产生数组 arr(5,2,2) => [2,4,6,8,10]
* eg:按1-10项产生斐波那契数列 =>arr(10, function (value, i, list) { return i > 1 ? list[i - 1] + list[i - 2] : 1; })
* @param {number} length 要产生的数组长度
* @param {number} value 数组项的初始值
* @param {number} step 递增值或处理函数(当前值,索引,当前产生的数组)
*/
export function arrFibonacci(length, value, step) {
if (isFunc(value)) {
step = value;
value = 0;
}
if (value == undefined) value = 0;
if (step == undefined) step = 1;
var list = [], i = 0;
if (isFunc(step)) {
while (i < length) {
value = step(value, i, list);
list.push(value);
i++;
}
} else {
while (i < length) {
list.push(value);
value += step;
i++;
}
}
return list;
}
/**
* 根据指定的键或索引抽取数组项的值
* eg:vals([{id:1},{id:2}], "id") => [1,2]
* eg:vals([[1,"a"],[2,"b"]], 1) => ["a","b"]
* @param {array} list 对象数组
* @param {string} prop 要抽取的属性
* @param {boolean} skipUndefined 是否跳过值不存在的项,默认为true
*/
export function arrVals(list, prop, skipUndefined) {
if (!list) return [];
skipUndefined = skipUndefined !== false;
var len = list.length,
i = 0,
item,
tmp = [];
for (; i < len; i++) {
item = list[i];
if (item && item[prop] != undefined) {
tmp.push(item[prop]);
} else if (!skipUndefined) {
tmp.push(undefined);
}
}
return tmp;
}</code></pre>
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