What is an acceptable way to remove a particular trailing character from a string?
For example if I had a string:
> "item,"
And I wanted to remove trailing ','s only if they were ','s?
Thanks!
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4 Answers
Use a simple regular expression:
var s = "item,";
s = s.replace(/,+$/, "");
2 Comments
Please treat your mods well.
Just wanted to add: don't forget the backslash if you're replacing characters that have meanings to regular expressions (for example, '.').
mdob
Just so you know, this is vulnerable to ReDoS. devina.io/redos-checker
if(myStr.charAt( myStr.length-1 ) == ",") {
myStr = myStr.slice(0, -1)
}
5 Comments
icktoofay
That
if should probably be a while.
Vicente Plata
Ummmm why?? If the last character is a comma, slice the last character... I mean the most probable use case for this, is when you get an element from an array and make a JSON-ish text or something. You go like 'foreach element print element and ","' but then you realize, "dude, i have an extra ','" and wanna remove it.
Kit Sunde
He says ","s in plural, but I agree the title is confusing.
Vicente Plata
Yeah I think it depends on what he wants to achieve. @Dutrow pls explain
Luke Taylor
It doesn't hurt to use a while, It's really unlikely that his specific need involved not stripping a trailing comma.
A function to trim any trailing characters would be:
function trimTrailingChars(s, charToTrim) {
var regExp = new RegExp(charToTrim + "+$");
var result = s.replace(regExp, "");
return result;
}
function test(input, charToTrim) {
var output = trimTrailingChars(input, charToTrim);
console.log('input:\n' + input);
console.log('output:\n' + output);
console.log('\n');
}
test('test////', '/');
test('///te/st//', '/');
2 Comments
Tomas Hesse
How would it perfom on '///te/st//,'/' ?
Brad Parks
@TomasHesse - seems to work! I added a snippet above to test it out
This will remove trailing non-alphanumeric characters.
const examples = ["abc", "abc.", "...abc", ".abc1..!@#", "ab12.c"];
examples.forEach(ex => console.log(ex.replace(/\W+$/, "")));
// Output:
abc
abc
...abc
.abc1
ab12.c
