Using map to return an empty array instead of [0] zero

Question

I have some working code that will take a string of words and return an array of the length of each word. For example:

let str = "hello world" returns [5, 5]

My issue is if str = "" (empty) it will return [0] instead of [] (empty array) which is what I'd like it to do. Does anyone have any ideas how I can alter my code to return this? Thank you!

const arr = str.split(' ');
return arr.map(words => words.length);

add if (str.length==0) return [0]

Evgeniy Belov
– Evgeniy Belov

2018-10-09 15:59:54 +00:00
Commented Oct 9, 2018 at 15:59 — Evgeniy Belov
– Evgeniy Belov, Commented Oct 9, 2018 at 15:59

KevBot · Accepted Answer · 2018-10-09 16:02:49Z

5

You can return an empty array if the string is equal to '' (empty string):

function count(str) {
  return (str === '') ? [] : str.split(' ').map(({length}) => length);
}

console.log(count('hello world'));
console.log(count(''));

answered Oct 9, 2018 at 16:02

KevBot

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Comments

Federico klez Culloca · Accepted Answer · 2018-10-09 16:00:42Z

3

Add a filter at the end.

const str = "";
const arr = str.split(' ');
console.log(arr.map(words => words.length).filter(count => count != 0));

answered Oct 9, 2018 at 16:00

Federico klez Culloca

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