String.prototype.trim()

The trim() method removes whitespace from both ends of a string and returns a new string, without modifying the original string. Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.).

A new string representing str stripped of whitespace from both its beginning and end.

If neither the beginning or end of str has any whitespace, a new string is still returned (essentially a copy of str), with no exception being thrown.

To return a new string with whitespace trimmed from just one end, use trimStart() or trimEnd().

The following example displays the lowercase string 'foo':

var orig = '   foo  ';
console.log(orig.trim()); // 'foo'

• String.prototype.trimStart()
• String.prototype.trimEnd()