Quickly Convert 0 or 1 (as a string) to a boolean

Recently, I came up against a somewhat typical situation. I was working with an API response that returned booleans as 0 or 1, instead of true or false. To make matters a bit more complicated, they were strings, not ints.

Initially, the thought was to write a little filter that took the value in, manually compared the values, and return true or false, but I stumbled across a better trick that’s much more simple. Let’s take a look:

var myFalsyValue = "0";
var myTruthyValue = "1";

!!+myFalsyValue // false
!!+myTruthyValue // true

That’s it! So, how does this work? Pretty simple, really: first the + in the operation changes the string to an integer (handy trick in an of itself). Then, the double bang (!!) performs a boolean comparison on it, converting the int to a bool as it reverses it, then reverses it back with the second bang.

Easy as that! Saved me a bunch of time, hopefully it will for you!

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