Easiest way of checking the truthy of a value in javascript?

Question

While programming with javascript, I come in some situations that I have a condition an wonder what values will pass that condition (if it will be truthy).

The solution I came up with is open the console in chrome and type if(foo) {true} and if the foo is truthy, it returns true, otherwise false.

An example of that is when I have some expression (foo) that won't return only true/false values. Inside the if it can return alot of things depending on the input (sometimes string, or number or maybe NaN).

But I fell that writing a if for that is too much.

Is there a easiest way of checking the truthy of a value in javascript?

Edit:

I'm looking for the easiest way of checking the truthy of a value, not just how to check and as I said in my question, I already do if(foo) {true} to check, but I'm looking for a easiest way

`!!something` performs the same transformation that an `if` statement performs. — Pointy, Jul 24 '19 at 12:36
`const thruthness = !!yourVariable`, or better yet `const thruthness = Boolean(yourVariableOrExpression)` — Roberto Zvjerković, Jul 24 '19 at 12:36
well, that did the trick, thanks guys. If you post the answer, I will accept it — Vencovsky, Jul 24 '19 at 12:38
`null`, `undefined`, `false`, `0`, `NaN` and `""` *(emty string)* are falsy, **everything** else is truthy; like a single space `" "` or any of these values as string, etc. — Thomas, Jul 24 '19 at 12:46
Also relevant: https://dorey.github.io/JavaScript-Equality-Table/ — VLAZ, Jul 24 '19 at 12:48

StefanN · Answer 1 · 2019-07-24T12:41:29.067

-2

I would use a ternary operator to shorthand the if-statement.

The result is something like this:

const foo = true;
console.log(foo ? 'truthy' : 'falsy'); // returns truthy

edited Jul 24 '19 at 12:41

answered Jul 24 '19 at 12:39

StefanN

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If you're using ternary you don't need to convert it to boolean, that happens automatically. – Roberto Zvjerković Jul 24 '19 at 12:40
@ritaj, correct. Edited my answer. – StefanN Jul 24 '19 at 12:41

Easiest way of checking the truthy of a value in javascript?

Edit:

1 Answers1