Nodejs String Trim trimChars(charlist)

Method Source Code

String.prototype.trimChars = function(charlist) {
   charlist = charlist || ' \r\n\t';
    var l = 0, i = 0;
    /*from w  ww  .j  av a  2 s.c  o m*/
    var ret = this;
    
    l = ret.length;
    for (i = 0; i < l; i++) {
        if (charlist.indexOf(ret.charAt(i)) === -1) {
            ret = ret.substring(i);
            break;
        }
    }
    
    l = ret.length;
    for (i = l - 1; i >= 0; i--) {
        if (charlist.indexOf(ret.charAt(i)) === -1) {
            ret = ret.substring(0, i + 1);
            break;
        }
    }
    
    return charlist.indexOf(ret.charAt(0)) === -1 ? ret : '';
};

Related

1. trim(str)

   String.prototype.trim = function(str) {
     str = str.replace(/^\s+/,'');
     for( var i = str.length - 1 ; i >= 0 ; i--) {
       if(/\S/.test(str.charAt(i))) {
           str = str.substring(0,i+1);
           break;
     return str;
   ...
   

2. trim(str)

   var trim = function (str) {
       return str.replace(/\s*/g, "");
   };
   

3. trim(ws)

   String.prototype.trim = function (ws)
       if(!this.length) return "";
       var tmp = this.stripNL().ltrim().rtrim();
       if(ws) return tmp.replace(/ +/g, ' ');
       else return tmp;
   String.prototype.rtrim = function ()
       if(!this.length) return "";
       return this.replace(/\s+$/g, '');
   String.prototype.ltrim = function ()
       if(!this.length) return "";
       return this.replace(/^\s+/g, '');
   String.prototype.stripNL = function ()
       if(!this.length) return "";
       return this.replace(/[\n\r]/g, '');
   

4. trim2()

   String.prototype.trim2 = function() {
     return this.replace(/^\s+|\s+$/g, '');
   };
   String.prototype.trim = function() {
     return this.replace(/^\s+/, '').replace(/\s+$/, '');
   };
   'foo     '.trim(); 
   '     foo'.trim(); 
   '  foo   '.trim(); 
   ...
   

5. trimBoth(s)

   String.prototype.trimBoth = function(s) {
       return this.replace(new RegExp("^" + s + "+|" + s + "+$", "gm"), "");
   

6. trimSlash()

   String.prototype.trimSlash = function () {
       var string = this.trim();
       if (string.charAt(0) == "/") {
           string = string.substring(1);
       if (string.charAt(string.length - 1) == "/") {
           string = string.substring(0, string.length - 1);
       return string;
   ...
   

7. trimSpace()

   'use strict';
   String.prototype.trimSpace = function() {
       var s = this;
       var n = s.length - 1;
       while (n >= 0 && s.charCodeAt(n) == 32) {
           n--;
       return n >= 0 ? s.substr(0, n + 1) : "";
   };
   ...
   

8. trimSpaces()

   String.prototype.trimSpaces = function () {
     var phrases = this.split(" ");
     var result = "";
     for (var i = 0; i < phrases.length; i++) {
       if (!phrases[i]=="") {
         if (result=="") {
           result = phrases[i];
         } else {
           result += " " + phrases[i];
   ...
   

9. trimStart(c)

   String.prototype.trimStart=function(c)
       c = c?c:' ';
       var i=0;
       for(;i<this.length && this.charAt(i)==c; i++);
       return this.substring(i);