Use toFixed() to elements of an array

Question

I have an array containing numerical values like this:

myArray = [432.2309012, 4.03852, 6546.46756];

I want to have maximum 2 digits after the dot so I use toFixed(2):

myArray.forEach(a => a.toFixed(2));

The result that is returned is undefined. Is something wrong?

you need `map` and to reassign the result to `myArray` – Federico klez Culloca Feb 26 '18 at 13:34 — Federico klez Culloca, Feb 26 '18 at 13:34

score 8 · Answer 1 · answered Feb 26 '18 at 13:35

8

You are not setting the value back. For each just iterates over the array and does not return anything. Use .map instead.

myArray = [432.2309012, 4.03852, 6546.46756];
myArray = myArray.map(a => a.toFixed(2));
console.log(myArray);

answered Feb 26 '18 at 13:35

void

Eddie · Answer 2 · 2018-02-26T13:45:50.400

forEach does not return any value and that is the reason why you are getting undefined. Use map instead

let myArray = [432.2309012, 4.03852, 6546.46756];
let result = myArray.map(a => a.toFixed(2));

console.log( result );

For more info, you can check doc of map

If you really want to use forEach, you have to push each value to an array

let myArray = [432.2309012, 4.03852, 6546.46756];
let result = [];
 
myArray.forEach(a => result.push( a.toFixed(2) ));

console.log( result );

2 Answers2