Question: What is the best way to check if a single character is a whitespace?

I know how to check this through a regex.

But I am not sure if this is the best way if I only have a single character.

Isn't there a better way (concerning performance) for checking if it's a whitespace?

If I do something like this. I would miss white spaces like tabs I guess?

```
if (ch == ' ') {
    ...
}

```

Answer: 
The regex approach is a solid way to go. But here's what I do when I'm lazy and forget the proper regex syntax:

```
str.trim() === '' ? alert('just whitespace') : alert('not whitespace');

```
@jake 's answer above -- using the `trim()` method -- is the best option. If you have a single character ch as a hex number:

```
String.fromCharCode(ch).trim() === ""

```

will return true for all whitespace characters.

Unfortunately, comparison like `<=32` will not catch all whitespace characters. For example; `0xA0` (non-breaking space) is treated as whitespace in Javascript and yet it is > 32. Searching using `indexOf()` with a string like `"\t\n\r\v"` will be incorrect for the same reason.

Here's a short JS snippet that illustrates this: <https://repl.it/@saleemsiddiqui/JavascriptStringTrim>