## 5 Answers

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You mean like getting the absolute value of a number? The `Math.abs`

javascript function is designed exactly for this purpose.

```
var x = -25;
x = Math.abs(x); // x would now be 25
console.log(x);
```

Here are some test cases from the documentation:

```
Math.abs('-1'); // 1
Math.abs(-2); // 2
Math.abs(null); // 0
Math.abs("string"); // NaN
Math.abs(); // NaN
```

Here is a fast way to obtain the absolute value of a number. It’s applicable on every language:

```
x = -25;
console.log((x ^ (x >> 31)) - (x >> 31));
```

4

If you want to see how JavaScript implements this feature under the hood you can check out this post.

# Blog Post

Here is the implementation based on the chromium source code.

```
function MathAbs(x) {
x = +x;
return (x > 0) ? x : 0 - x;
}
console.log(MathAbs(-25));
```

1

I think you are looking for `Math.abs(x)`

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Math/abs

Alternative solution

```
Math.max(x,-x)
```

```
let abs = x => Math.max(x,-x);
console.log( abs(24), abs(-24) );
```

Also the Rick answer can be shorted to `x>0 ? x : -x`

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