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Chalarangelo
2020-09-29 19:22:26 +03:00
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blog_posts/javascript-boolean-function.md
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@ -9,7 +9,7 @@ excerpt: JavaScript's built-in Boolean function can be very useful for truth-che
JavaScript's built-in [`Boolean`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean) is one of those things I find myself suggesting in code reviews quite often as of late, so I thought I could share some tips about it with the world.
**Using Boolean for truth-checking**
### Using Boolean for truth-checking
The `Boolean()` function is particularly useful when truth-checking data and probably significantly more readable than the double negation (`!!`) operation:
@ -37,7 +37,7 @@ const hasValidValue = values.some(Boolean);
const nonEmptyValues = values.filter(Boolean);
```
**Handle Boolean objects with care**
### Handle Boolean objects with care
While the `Boolean()` function is pretty useful, you might run into some issues with the `Boolean` object and the `new Boolean()` constructor. The `Boolean` object is an object wrapper for a boolean value, but the tricky part is that, as an object, it's always truthy even if the contained value is `false`!