将值从数组添加到对象javascript

Question

I have an array.

var nestedArr =[['loop0', 0], ['loop1', 1], ['loop2', 2], ['loop3', 3], ['loop4', 4], ['loop5', 5]]

I have to get using for loop this:

var obj = { loop0: 0, loop1: 1, loop2: 2 ...};

I am trying this :

for(var j = 0; j < nestedArr.length; j++){
    obj[nestedArr[j][0]] = nestedArr[j][1]}

but I am getting values as undefined. How do I add values correctly.

Answer 1

You can use reduce function as below:

 var nestedArr = [ ['loop0', 0], ['loop1', 1], ['loop2', 2], ['loop3', 3], ['loop4', 4], ['loop5', 5] ]; var output = {}; nestedArr.reduce(function(itm) { output[itm[0]] = itm[1]; }); console.log(output); 

Your loop also is correct:

 var nestedArr = [ ['loop0', 0], ['loop1', 1], ['loop2', 2], ['loop3', 3], ['loop4', 4], ['loop5', 5] ]; var obj = {}; for (var j = 0; j < nestedArr.length; j++) { obj[nestedArr[j][0]] = nestedArr[j][1] } console.log(obj) 

Answer 2

Working fine for me. Just added the definition of obj

 var nestedArr =[['loop0', 0], ['loop1', 1], ['loop2', 2], ['loop3', 3], ['loop4', 4], ['loop5', 5]], obj = {}; for(var j = 0; j < nestedArr.length; j++){ obj[nestedArr[j][0]] = nestedArr[j][1] } console.log(obj) 

Answer 3

Using Array.prototype.reduce you can do this.

 var nestedArr =[['loop0', 0], ['loop1', 1], ['loop2', 2], ['loop3', 3], ['loop4', 4], ['loop5', 5]] const res = nestedArr.reduce((acc, v) => { acc[v[0]] = v[1]; return acc; }, {}); console.log(res);