CODEWITHSUNDEEP
typescript
Heinrich Schmetterling
Heinrich Schmetterling

Reputation: 6884

TypeScript: correct way to do string equality?

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.

Upvotes: 113

Views: 275027

Answers (3)

Nikhil
Nikhil

Reputation: 1018

Use below code for string comparison

if(x === y) {

} else {

}

Upvotes: 5

tamer badawy
tamer badawy

Reputation: 1

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

Upvotes: -23

ssube
ssube

Reputation: 48277

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.

Upvotes: 99

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