Turn array into objects, and add key values from another object

Question

I have two arrays of the same length:

A simple array

arr1 = [1,2,3]

And another array of objects

arr2 = [
  {cat: "a", other: 0},
  {cat: "b". other: 0},
  {cat: "c", other: 0}
]

I want to combine the two arrays into a new array, taking the values from the first array and giving them the key node , and combining all the cat s as below:

end = [
 {node: 1, cat: "a"},
 {node: 2, cat: "a"},
 {node: 3, cat: "a"},
]

Answer 1

 arr2 = [ {cat: "a", other: 0}, {cat: "b", other: 0}, {cat: "c", other: 0} ]; arr1 = [1,2,3]; let res = []; for (let i=0; i<arr1.length; i++) { res.push({node: arr1[i], cat: arr2[i].cat}); } console.log(res);

Answer 2

You can just map through it and build the array and create the new objects at the same time

This one merged all objects together

    arr1.map((value, idx) => ({ ...arr2[idx], node: value }))

If you want to just get the cat of arr2 then do this

    arr1.map((value, idx) => ({ cat: arr2[idx].cat, node: value }))

 arr1 = [1,2,3]; arr2 = [ {cat: "a", other: 0}, {cat: "b", other: 0}, {cat: "c", other: 0} ]; end = arr1.map((value, idx) => ({ cat: arr2[idx].cat, node: value })); console.log(end)