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: 
@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>
```
var testWhite = (x) {
    var white = new RegExp(/^\s$/);
    return white.test(x.charAt(0));
};

```

This small function will allow you to enter a string of variable length as an argument and it will report "true" if the first character is white space or "false" otherwise. You can easily put any character from a string into the function using the indexOf or charAt methods. Examples:

```
var str = "Today I wish I were not in Afghanistan.";
testWhite(str.charAt(9));  // This would test character "i" and would return false.
testWhite(str.charAt(str.indexOf("I") + 1));  // This would return true.

```