How do I get an array of substrings from an array of strings?

Question

I have an array of string like:

var myArray=['rwt-cable1','rwt-cable42','rwt-cable40',...]

But what I am really interested in is:

['cable1','cable42','cable40',...]

What would be the best way? I'm currently looping through items and extract substrings to get my output array.

I'd do a myArray.map(..), but yes, ultimately you need to loop and substring/regex-replace or something along those lines. — deceze
– deceze ♦, Commented Apr 19, 2016 at 12:50
['rwt-cable1', 'rwt-cable42', 'rwt-cable40'].forEach(function(elem, index) { ip[index] = elem.replace('rwt-', ''); }); — Rayon
– Rayon, Commented Apr 19, 2016 at 12:54

isvforall · Accepted Answer · 2016-05-19 22:50:43Z

8

You could use split and map function

var res = ['rwt-cable1', 'rwt-cable42', 'rwt-cable40'].map(e => e.split('-')[1]);

console.log(res);

edited May 19, 2016 at 22:50

answered Apr 19, 2016 at 12:51

isvforall

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3 Comments

Madara's Ghost Over a year ago

I've removed the off-topic comments on this post. If you spot bad practices in code, feel free to edit those out as long as the meaning of the answer doesn't change. Changing the means of output while not touching the actual logic that makes the answer is fine.

RomanPerekhrest Over a year ago

that was pretty funny(those comments about document.write) ... the discussion could be endless ))

royhowie Over a year ago

@MadaraUchiha document.body.textContent = res; seems to not work in Safari.

Peter Mortensen · Accepted Answer · 2016-04-19 20:51:38Z

1

You can do it by using a regular expression:

var myArray= ['rwt-cable1','rwt-cable42','rwt-cable40'];
myArray = myArray.map(v => v.replace(/^rwt\-/,""));
console.log(myArray); //["cable1", "cable42", "cable40"]

The regex ^rwt\- will match the text rxt- at the beginning of the string.

edited Apr 19, 2016 at 20:51

Peter Mortensen

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answered Apr 19, 2016 at 12:52

Rajaprabhu Aravindasamy

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1 Comment

deceze Over a year ago

You've got my vote for explicitly only targeting the beginning of the string.

RomanPerekhrest · Accepted Answer · 2016-04-19 12:54:02Z

1

The alternative using Array.map and Array.slice functions:

var myArray = ['rwt-cable1','rwt-cable42','rwt-cable40'],
    result = myArray.map(function(v){ return v.slice(4); });

console.log(result);   // ["cable1", "cable42", "cable40"]

answered Apr 19, 2016 at 12:54

RomanPerekhrest

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Comments

royhowie · Accepted Answer · 2016-04-20 20:50:30Z

1

A simpler approach would be

['rwt-cable1', 'rwt-cable42', 'rwt-cable40'].map(x => x.replace('rwt-', ''))
// ["cable1", "cable42", "cable40"]

edited Apr 20, 2016 at 20:50

royhowie

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answered Apr 19, 2016 at 12:50

Jagdish Idhate

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