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!

Related Posts

Shitty Sales Have Made Product Development Harder

Shitty, one-sided sales processes have made product development much more difficult for early stage startups.

Why I'm Cold Emailing You

You might have gotten a cold email from me. Tasteless? Some people think so. Here's why I'm doing it.

How I Found Your Email

I've been cold emailing a lot of people, and many folks are surprised that I found their email. Here's where I dug it up.

Announcement: The Most Exciting Thing I've Done

Today, I'm announcing the most exciting project I've been involved with. It's called CrowdSync, and it helps to automate paperwork, communication and logistics when dealing with groups of people. Read on for why this is so big.

How to Post to Private Slack Channels from Zapier

If you automate posting to Slack via Zapier, you might need to post to a private channel. It's not entirely obvious how to do it, but actually pretty damn easy.

Sharing is the Currency of the Web

You consume free content all day on the web. The best way to pay back the people creating it? Share it.

The Magic of Low Fidelity

High-fidelity documentation is great, but it has a hidden dark side. Learn to embrace low-fidelity documentation, and you'll be amazed at the benefits.

Why You Should Blog More (Data)

When you stop blogging, people stop coming. Simple enough. Here's the proof.

Using a Linter Will Make You a Better Dev

Using a linter while you write code won't only make your code better formatted, it'll make you a better programmer.

Everyone Is Self Employed

The idea that you're not self-employed if you work fulltime somewhere is wrong. EVERYONE is self-employed.