adding values from an array to object 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

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 2

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 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);