Add Property to Object Array From Other Array - JS

Question

I want to add a property to an array of objects from another existing array (both from the same length)

Example:

var array1 = [1, 2, 3];
var array2 = [{word: "hey"}, {word: "hello"}, {word: "world"}]

//Wanted Outcome: array2 = [{word: "hey", id: 1}, {word: "hello", id: 2}, {word: "world", id: 3}]

What I've tried:

for(var i=0; i<array1.length; i++){
    for(var j= 0; j<array2.length; j++){
       array2[j].id = array1[i];
  }
}
//Outcome Im getting: array2 = [{word: "hey", id: 3}, {word: "hello", id: 3}, {word: "world", id: 3}]

How can I add a different property based on the first array length to the second array?

Bulent · Accepted Answer · 2020-10-28 16:34:50Z

2

This is what you need

array2.forEach((item, i) => {
  item.id = array1[i]
})

answered Oct 28, 2020 at 16:34

Bulent

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Comments

Maheer Ali · Accepted Answer · 2020-10-28 16:35:40Z

You don't need a nested loop here. Just you one level for loop and use i as both the indices

var array1 = [1, 2, 3];
var array2 = [{word: "hey"}, {word: "hello"}, {word: "world"}]
for(let i = 0; i < array2.length; i++){
  array2[i].id = array1[i];
}
console.log(array2);

Cleaner way for doing this is to use map()

var array1 = [1, 2, 3];
var array2 = [{word: "hey"}, {word: "hello"}, {word: "world"}]
array2 = array2.map((x, i) => ({...x, id: array1[i]}));
console.log(array2);

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