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javascriptarrays
Yorbjörn
Yorbjörn

Reputation: 456

Create array with the length based on a number

I have this var let number = 3

I'd like to create an array with the length based on the number listed above, But the content should be a string like this:

"item {index of item in array}",

so my array should look like this: let array = ['item 0', 'item 1', 'item 2']

Righ now I have this code:

let number = 2
let array = Array.from(Array(number).keys())
// outcome --> [ 0 , 1 ]

But I don't know how to add the strings in a correct way

Upvotes: 1

Views: 101

Answers (3)

benada002
benada002

Reputation: 281

You can try this.

let number = 2;
let array = Array(number).fill().map((ele, i) => `item ${i}`);

Upvotes: 0

John V
John V

Reputation: 875

You can use this solution

let arr = [...Array(number).keys()].map(x=>`item ${x}`);

or

let arr = [...Array(number)].map((y, x)=>`item ${x}`);

Upvotes: 1

Ori Drori
Ori Drori

Reputation: 191976

Array.from() accepts a callback, and you can use it to create the items.

const number = 2

const array = Array.from(Array(number).keys(), k => `item ${k}`)

console.log(array)

In addition, you can use the index (i) of the item as the counter.

const number = 2

const array = Array.from(Array(number), (_, i) => `item ${i}`)

console.log(array)

Upvotes: 2

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