How to Filter an array of strings based on first word in the string in javascript?

Question

With the following array of strings in javascript, is there a way to use the .filter to filter by the first word?

['Desk_One', 'Desk_Two', 'Desk_Three', 'Chair_One', 'Chair_Two']

For example to .filter(x = 'Desk_*')

 ['Desk_One', 'Desk_Two', 'Desk_Three']

Maybe this needs to be a regex

[`startsWith`](https://stackoverflow.com/questions/646628/how-to-check-if-a-string-startswith-another-string/646643) will do. — Wiktor Stribiżew, May 26 '21 at 16:54
is the elements will always have underscore between 2 words? — Rajdeep Debnath, May 26 '21 at 16:54
Always two words and one underscore, and there are groups where the first word is the same. — Marci, May 26 '21 at 19:00

Nenad Milosavljevic · Accepted Answer · 2021-05-26T19:22:35.573

4

You can use startsWith() function like this:

let array = ['Desk_One', 'Desk_Two', 'Desk_Three', 'Chair_One', 'Chair_Two'];

let result = array.filter((item)=>item.startsWith(array[0].split('_')[0]));
console.log(result)

edited May 26 '21 at 19:22

answered May 26 '21 at 16:55

Nenad Milosavljevic

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`Desk_` is hardcoded. – Rajdeep Debnath May 26 '21 at 16:56
It is hardcoded in question also. Let us ask for more details. – Nenad Milosavljevic May 26 '21 at 16:57
no in question he requested for by the first word – Rajdeep Debnath May 26 '21 at 16:58
You'd need regex in order to assert that `Desk_` is the first set of characters in the string – Andrew May 26 '21 at 16:59
Ok, I updated the answer. Tnx. – Nenad Milosavljevic May 26 '21 at 17:02
String method startsWith should be more appropriate in this case, regex seems like overkill – GhaziBenDahmane May 26 '21 at 17:03
@Andrew regex always easy but a heavy operation. – Nitin . May 26 '21 at 17:05
You are also right. Let me update the answer again. – Nenad Milosavljevic May 26 '21 at 17:05
This is perfect now, thanks for hashing this out – Marci May 26 '21 at 19:02

How to Filter an array of strings based on first word in the string in javascript?

1 Answers1