Add set amount of items to an array JavaScript

Question

I want to find how many 25 can fit into a number example 100 should return [25, 25, 25 ,25]
At the moment I have this code

let quarterAmount = parseInt(argument / 25)
sum.push( 25 * quarterAmount )

However when I return the sum variable it will give me [100] instead of the desired array of 25. I have tried many variations of my code and I always get the same results

sum.push( '25' * quarterAmount )

sum.push( [25 * quarterAmount] )

sum.push( [25] * quarterAmount )

I want to be able to add quarterAmount amount of [25] to my array, how can I acomplish this?

nanobar · Accepted Answer · 2022-01-25 19:35:35Z

3

Something like this?

const howManyTimes = (a, b) => new Array(b/a).fill(a)

console.log(howManyTimes(25, 100))

new Array(n) creates an array with n items, then fill sets all the items to the same value.

answered Jan 25, 2022 at 19:35

nanobar

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1 Comment

Dylan Bozarth Over a year ago

This is a working solution, thank you.

Herobrine · Accepted Answer · 2022-01-25 19:42:25Z

1

The naive solution would be to make a loop like this:

let quarterAmount = floor(argument / 25);
sum = [];
for (let i=0; i < quarterAmount; i++) {
    sum.push(25);
}

But there's a more convenient way of achieving what you want:

let quarterAmount = floor(argument / 25);
sum = Array(quarterAmount).fill(25);

Here is the related documentation (about Array.fill): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill

On a side note, I think you shouldn't use parseInt, but rather floor, ceil or round. parseInt will floor your value, but your intent is not to parse something, it is to round/floor/ceil something.

edited Jan 25, 2022 at 19:42

answered Jan 25, 2022 at 19:38

Herobrine

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2 Comments

Dylan Bozarth Over a year ago

How can I accomplish this with 4 different amounts? say first it should be 25, then 10, and so on?

Herobrine Over a year ago

@imstupidpleasehelp I would suggest creating a function with two argument being the sum and the divider. Then, just replace "25" with your divider variable. You'll have to call this function for all your amounts.

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