Lodash 方法库 原生实现 待完结。。。

 1 let _ = {
 2     chunk(arr, nub) {
 3         var res = [];
 4         for (var i = 0; i < arr.length; i += nub) {
 5             result.push(arr.slice(i, i + nub))
 6         };
 7         console.log(res)
 8         return result;
 9     },
10     compact (arr) {
11         let res = [];
12         arr.forEach( item => {
13             typeof item === ‘number‘ && res.push(item)
14         } );
15         console.log(res)
16         return res
17     }
18 };
19 
20 _.chunk([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13], 3)
21 _.compact([0, 1, false, 2, ‘‘, 3, null, ‘1‘]);