Nodejs String Trim trimTailChars(c)

Method Source Code

// this is slow, avoid if possible
String.prototype.trimTailChars = function(c){
  var idx, len = this.length;
  var tmp = this;
  while(len--){// w  w w.jav  a  2 s  . c om
    idx = tmp.lastIndexOf(c);
    if(idx == -1) {
      break;
    }
    tmp = tmp.substring(0,idx);
  }
  return tmp;
};

String.prototype.trimTailChar = function(c){
  var idx, len = this.length;
  var tmp = this;
  while(len--){
     idx = tmp.charAt(len);
     if(idx != c){
       break;
     }
  }
  return tmp.substring(0,len + 1);
};

String.prototype.countTailChar = function(c){
  var idx, len = this.length;
  while(len--){
     idx = this.charAt(len);
     if(idx != c){
       break;
     }
  }
  return this.length-(len + 1);
}

// too complicated, not worth the hassle
//String.prototype.trimLeadChars = function(c){};

String.prototype.trimLeadChar = function(c){
  var idx, len = 0;
  var tmp = this;
  while(len++ < this.length){
     idx = tmp.charAt(len);
     if(idx != c){
       break;
     }
  }
  return tmp.substring(len,this.length-1);
};

Related

1. 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) : "";
   };
   ...
   

2. 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];
   ...
   

3. 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);
   

4. trimStart(s)

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

5. trimString_trim()

   String.prototype.trim = function String_trim()
     this.replace(/^\s+/m, '').replace(/\s+$/m, '');
   

6. trimToLength(m)

   String.prototype.trimToLength = function(m) {
     return (this.length > m) 
       ? jQuery.trim(this).substring(0, m).split(" ").slice(0, -1).join(" ") + "..."
       : this;
   };
   

7. trimToLength(m)

   String.prototype.trimToLength = function(m) {
     return (this.length > m) 
       ? jQuery.trim(this).substring(0, m).split(" ").slice(0, -1).join(" ") + "..."
       : this;
   };
   

8. trimToLength(m)

   String.prototype.trimToLength = function(m) {
     return (this.length > m) ? jQuery.trim(this).substring(0, m).split(' ').slice(0, -1).join(' ') : this.replace('"', '');
   };
   

9. trimToPx(length)

   String.prototype.trimToPx = function(length)
       var tmp = this;
       var trimmed = this;
       if (tmp.visualLength() > length)
           trimmed += "...";
           while (trimmed.visualLength() > length)
               tmp = tmp.substring(0, tmp.length-1);
               trimmed = tmp + "...";
       return trimmed;