Membuat fungsi trim pada object String di Javascript

Menghapus karakter atau spasi di awal dan akhir string.

	// @param st: The string that will be trimmed. @default whitespace
	String.prototype.strim = function(st) {
	st = st || "\\s";
	return this.replace(new RegExp("^"+st+"+|"+st+"+$",'g'),'');
	}
	/*
	example:
	"alorem ipsuma".strim('a'); // return "lorem ipsum"
	" lorem ipsum ".strim(); // return "lorem ipsum"
	*/

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