In programming, trim (or strip) is a common string manipulation function which removes leading and trailing whitespace from a string. Precisely what constitutes whitespace varies between programming languages and implementations, but normally includes space, tab, line feed, and carriage return characters.
Using Loops:
function trim(str) {
while (str.substring(0, 1) == ' ') {
str = str.substring(1, str.length);
}
while (str.substring(str.length - 1, str.length) == ' ') {
str = str.substring(0, str.length - 1);
}
return str;
}
Usage:
var str = ' abc ';
var trimmedStr = trim(str);
OR
Using Regular Expressions
function trim(str) {
return str.replace(/^\s+|\s+$/g,'');
}
Usage:
var str = ' abc ';
var trimmedStr = trim(str);
OR
Using an Object Oriented Approach
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g, '');
}
Usage:
var str = ' abc '; // OR var str = new String(' abc ');
var trimmedStr = str.trim();
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