CODEWITHSUNDEEP
javascriptcastingtype-conversion
Ayush Gupta
Ayush Gupta

Reputation: 9295

Which is a better way to cast to Boolean in JavaScript?

In JavaScript, which is a more efficient way to cast a value to Boolean type,

let booleanVal = !!valueToCast;

or

let booleanVal = Boolean(valueToCast);

PS I need to typecast in an array tof 1000 elements in api in some use case, so I was wondering which one had the least overhead

Upvotes: 2

Views: 762

Answers (1)

rgthree
rgthree

Reputation: 7273

There's already a jsperf that measures the difference between the two at https://jsperf.com/bool-cast-vs-not which shows that in most browsers Boolean(value) was significantly slower than !!value (though, now in the newer Chrome 59+ it is slightly faster).

However, even at the slowest it was still over 30,000,000 operations a second making it pretty insignificant for your 1000 element dataset.

So choose whichever you like :)

Upvotes: 3

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