If I know x and y are both of type string, is the correct way to do string equality simply x == y?
The linter I'm using complains about this.
asked Jan 4, 2015 at 21:20
Heinrich Schmetterling
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1What does the linter say?JJJ– JJJ2015-01-04 21:27:26 +00:00Commented Jan 4, 2015 at 21:27
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2possible duplicate of Javascript String Equality... What's the correct way?xmojmr– xmojmr2015-01-04 22:19:21 +00:00Commented Jan 4, 2015 at 22:19
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3 Answers
If you know x and y are both strings, using === is not strictly necessary, but is still good practice.
Assuming both variables actually are strings, both operators will function identically. However, TS often allows you to pass an object that meets all the requirements of string rather than an actual string, which may complicate things.
Given the possibility of confusion or changes in the future, your linter is probably correct in demanding ===. Just go with that.
Comments
Use below code for string comparison
if(x === y) {
} else {
}
Comments
The === is not for checking string equalit , to do so you can use the Regxp functions for example
if (x.match(y) === null) {
// x and y are not equal
}
there is also the test function
2 Comments
Paaske
@Brain Well, I think that the opening statement is directly wrong. You can absolutely check for (string) equality with
===. And the tagged "possible duplicate answer" as well as this answer goes much into detail on comparisons. None of them suggests using .match()
Donald Duck is with Ukraine
This is wrong.
=== can (and should) be used to check for string equality, but match can't. For example, "^$".match("^$") returns null, "a".match(".") does not return null, and "(".match("(") is a runtime error.