如何检查内部的所有数组元素 endwith()

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?']

Answer 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);

Answer 2

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.