How to remove a string from each element from an Array?

Question

I have an Array:

arr1 = ["gbt100", "gbt1130", "gbt12300", "gbt104230"]

How can I remove the "gbt" string from each of the elements?

Please read the docs on [`Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array#Methods_2) methods. What have you tried? — Sebastian Simon, May 21 '18 at 08:55
I've read about the foreach and filter methods. I just don't know how to apply it. — PAyTEK, May 21 '18 at 08:58
@PAyTEK You want to create a new array with the same elements of the old array, but transformed in a way. This means you need `map`, not `filter`, not `forEach`. — Sebastian Simon, May 21 '18 at 09:00

Mihai Alexandru-Ionut · Accepted Answer · 2018-05-21T09:18:20.780

8

You can use the map method by passing a callback function as an argument which is applied for every item from your given array.

Also, you need to use replace method in order to remove the gbt string.

arr1 = ["gbt100", "gbt1130", "gbt12300", "gbt104230"]
arr1 = arr1.map(elem => elem.replace("gbt", ""));
console.log(arr1);

Another approach is to pass a regex as the first argument for the replace method.

arr1 = ["gbt100", "gbt1130", "gbt12300", "gbt104230"]
arr1 = arr1.map(elem => elem.replace(/gbt/g, ""));
console.log(arr1);

If you want to remove all the alphabetical chars just change the regex expression inside replace method.

arr1 = arr1.map(elem => elem.replace(/[a-zA-Z]/g, ""));

edited May 21 '18 at 09:18

answered May 21 '18 at 08:56

@Xufox, what if array is like gbt567, abg455, ytu456 ? – Akhil Aravind May 21 '18 at 09:02
@akhilaravind you mean to remove all alphabetic characters then use `[a-zA-Z]` instead of gbt to replace all alphabets – Nagaraju May 21 '18 at 09:04
@akhilaravind Don't make up scenarios OP hasn't asked for, otherwise you end up answering questions nobody asked. If OP states the values to remove could be different and gives the exact specifications, then we can tailor solutions around it. Otherwise your scenario is out of scope. – Nope May 21 '18 at 09:05
@Nagaraju i have answered below – Akhil Aravind May 21 '18 at 09:05
@xufox yes I was correcting that – Nagaraju May 21 '18 at 09:06
@akhilaravind why do you want to answer that OP did'nt ask about? – Nagaraju May 21 '18 at 09:07
@akhilaravind, if you want to remove all aphabetic chars you can look at the updated answer. – Mihai Alexandru-Ionut May 21 '18 at 09:07

score -1 · Answer 2 · answered May 21 '18 at 08:57

-1

You can try Array.Map and for each of the item using substring

const arr1 = ["gbt100", "gbt1130", "gbt12300", "gbt104230"]

const newArr = arr1.map(x=>x.substring(3, x.length))

console.log(newArr)

answered May 21 '18 at 08:57

Isaac

2 Answers2