Flatten an array with an object

One, flatten an array

A problem encountered a few days ago, there is an array of Var str=[1,2,1,[4,5,[6,7,[8,9]]]; How to say this array is flattened, removing these repeating brackets. I also think for a long time to write out, here to share to you.

　　

1 varstr=[1,2,1,[4,5,[6,7,[8,9]]]];2         functionarr (str,depth) {//depth represents the number of flattening3             varNewarr=[]; Create a new array to add the original array elements and the array after the structure4Str.foreach (item=>{5                 if(Array.isarray (item) && depth>0{//array.isarray (); Determines whether an element is an array, the return value is true, or false6Newarr.push (... (Arr (Item,--Depth)))  This takes advantage of the ES6 array of structures and recursion7}Else{8 Newarr.push (item);9                 }Ten             })     One             returnNEWARR; A         } -Console.log (arr (str,8))

Extended:... Use of arrays

1 var arr=[1,5,4,2,10,8,8,20,15,14,12]; 2         function Minarr (arr) {3             return math.min (... arr);//To deconstruct an array 4         }5         console.log (Minarr (arr))//1

Two, the method of flattening an object

I encountered this problem, using a lot of methods, write a lot of code, looked up the data found a very simple method.

1 var obj={0:1,1:1,length:2};

2 Console.log (Array.prototype.slice.call (obj));

Flatten an array with an object