how to push map to a new array using javascript

Question

I have the following code which is inside for each loop

    let array:[];

    result =  campaignsPerAffiliate.map(campaign => campaign.id)// returns 0001,00ec6,0caa4

now I want to push all these to an array one after another and because we are inside for each there will be more numbers so I will end up with [0001,00ec6,0caa4,000,1111]

  result.forEach(element => {
  array=array.push(element)
});

this doesnt seem to work

Remove array=. It's setting the whole array to the result of array.push, which will only be one value. Consider creating a copy instead? array = result.slice() — evolutionxbox
– evolutionxbox, Commented Oct 20, 2020 at 11:54
Is array defined variable? Share all of the foreach loop which you are talking about. — Elvaleryn
– Elvaleryn, Commented Oct 20, 2020 at 11:56
I know you didn‘t ask but array=array.concat(result) would also work. — Nikolaus
– Nikolaus, Commented Oct 20, 2020 at 11:58

Nate Levin · Accepted Answer · 2020-10-20 12:04:38Z

1

Array.push returns the new length of the array, not the array. Thus, if you want to do it your way, you need to remove array=.

However, combining arrays can be done much easier with Array.concat.

See an example of both working properly here:

let array = [];
let result = ["001", "002", "003"];
console.log("With concat: ", array.concat(result));
result.forEach(val=>{
  array.push(val);
});
console.log("With forach: ", array);

answered Oct 20, 2020 at 12:04

Nate Levin

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