How to Check All Array Element Inside endswith()

Question

let array1 = ["?", "!", "."];
let array2 = ["live.", "ali!", "harp", "sharp%", "armstrong","yep?"];

console.log(array2.filter((x) => x.endsWith("?")));

The output is just: ['yep?']

Because the function endsWith() only checked for "?" as you see in the code. How do I loop the elements on the array1 (suffixes) inside the endsWith function so the output is:

['live.', 'ali!', 'yep?']

Andy · Accepted Answer · 2022-06-11T12:41:15.790

1

You could use a regex, and then match each element in the filter iteration against it.

/[?!.]$/ says match one of these things in the group ([?!.]) before the string ends ($).

const arr = ['live.', 'ali!', 'harp', 'sharp%', 'armstrong', 'yep?'];
const re = /[?!.]$/;

const out = arr.filter(el => el.match(re));
console.log(out);

Regarding your comment you can pass in a joined array to the RegExp constructor using a template string.

const query = ['.', '?', '!'];
const re = new RegExp(`[${query.join('')}]$`);

const arr = ['live.', 'ali!', 'harp', 'sharp%', 'armstrong', 'yep?'];

const out = arr.filter(el => el.match(re));
console.log(out);

edited Jun 11 '22 at 12:41

answered Jun 11 '22 at 11:20

Andy

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How do you make this so you can input an array inside the regex instead? so instead of suffix... we get the strings with [ "ive." , "li!" , "ep?"] – Royal ey Jun 11 '22 at 12:07
@Royaley added a new example showing how to use an array in a regex. – Andy Jun 11 '22 at 12:17
1

Regex is so powerful oof, I can't thank you enough for this. much love bruh <3 – Royal ey Jun 11 '22 at 12:33

score 0 · Answer 2 · answered Jun 11 '22 at 11:09

You can use an inner .some() call to loop over your array1 and return true from that when you find a match instead of hardcoding the ?:

const array1 = ["?", "!", "."];
const array2 = ["live.", "ali!", "harp", "sharp%", "armstrong","yep?"];

const res = array2.filter((x) => array1.some(punc => x.endsWith(punc)));
console.log(res);

Above, when you return true (or a truthy value) from the .some() callback, the .some() method will return true, otherwise it will return false if you never return true, thus discarding it.

How to Check All Array Element Inside endswith()

2 Answers2