How to remove space from last element in array Javascript

Question

So i am wondering how i can remove the space of last element in array.

Let's say i have a string:

 let str = "d d, b b, c c, d d ";
 let split = str.split(", ");
 let arr = split.map(str => str.replace(/\s/g, '_'));
 console.log(arr);

So as you can see i am chaining words inside array, but i have a problem that my last item in array have whitespace at the end which end with "_" at the end. How i can remove that space from the last element without removing the space between d d?

• mplungjan: let arr = "d d, b b, c c, d d ".trim().replace(/ /g,"_").split(",");

Answer 1

You can use String.prototype.trim().

The trim() method removes whitespace from both ends of a string. Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.).

let str = "d d, b b, c c, d d ";
let split = str.trim().split(", ");
let arr = split.map(str => str.replace(/\s/g, '_'));
console.log(arr);

Answer 2

Use str.trim() before replace():

let str = "d d, b b, c c, d d ";
let split = str.split(", ");
let arr = split.map(str => str.trim().replace(/\s/g, '_'));
console.log(arr);

• Mark Rune: Thanks for your help!

Answer 3

One option would be to match word characters with a single space between them instead:

const str = "d d, b b, c c, d d ";
const strArr = str.match(/\w+ \w+/g)
const arr = strArr.map(str => str.replace(/\s/g, '_'));
console.log(arr);

• Mark Rune: Thanks for your help!
• Ankit Agarwal: It is something not related with this answer, but I think you can help me here stackoverflow.com/questions/53443925/…

Answer 4

You could trim the string before splitting.

let str = "d d, b b, c c, d d ";
let split = str.trim().split(", ");
let arr = split.map(str => str.replace(/\s/g, '_'));
console.log(arr);

• Mark Rune: Thanks for your help!
• Ankit Agarwal: It is something not related with this answer, but I think you can help me here stackoverflow.com/questions/53443925/…

Answer 5

trim white space using trim() it before splitting

let str = "d d, b b, c c, d d ";
let split = str.trim().split(", ");
let arr = split.map(str => str.replace(/\s/g, '_'));
console.log(arr);

Answer 6

Trim and replace before splitting

console.log(
 "d d, b b, c c, d d ".trim().replace(/ /g,"_").split(",")
)