javascript tutorial - [5 Solutions] Trim a string in JavaScript - javascript - java script - javascript array
Problem:
How do we trim a string in JavaScript?
Solution 1:
This is generally recommended when extending Native Objects! Note that the added property is enumerable unless you use ES5 Object.defineProperty!
if (!String.prototype.trim) {
(function() {
// Make sure we trim BOM and NBSP
var rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g;
String.prototype.trim = function() {
return this.replace(rtrim, '');
};
})();
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Solution 2:
The trim from jQuery is convenient if we were already using this framework.
$.trim(' your string ');
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Solution 3:
ideally any attempt to prototype the trim method should really check to see if it already exists first.
if(!String.prototype.trim){
String.prototype.trim = function(){
return this.replace(/^\s+|\s+$/g,'');
};
}
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Solution 4:
There are lot of implementations that can be used.
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g, "");
};
" foo bar ".trim(); // "foo bar"
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Solution 5:
/**
* Trim string. Actually trims all control characters.
* Ignores fancy Unicode spaces. Forces to string.
*/
function trim(str) {
str = str.toString();
var begin = 0;
var end = str.length - 1;
while (begin <= end && str.charCodeAt(begin) < 33) { ++begin; }
while (end > begin && str.charCodeAt(end) < 33) { --end; }
return str.substr(begin, end - begin + 1);
}