Nodejs String Truncate truncate(length, substitute)

Method Source Code

/**//from  w w w .j  a va  2s.  co  m
 * Truncates the string to the given length and replaces superfluous characters
 * with the given substitute.
 *
 * @example  'This is a longer text'.truncate(7)
 *           'This is?'
 *
 * @param    [length] {Number} The number of characters after which the text
 *                             should be truncated. (default: 30)
 * @param    [substitute] {String} The substitute to append if the text exceeds
 *                                 the given limit. (default: '?')
 *
 * @return   {String} Returns the truncated string, followed by the substitute.
 */

String.prototype.truncate = String.prototype.truncate || function (length, substitute) {
  return this.length > (length || 30) ? this.substr(0, (length || 30)).replace(/\s$/, '') + (substitute || '?') : this.toString()
}

Related

1. truncate(capLength)

   String.prototype.truncate = function(capLength){
     var trunc = '..';
     var output = this;
     if(typeof capLength !== 'number'){
       console.log('Arg must be a number type. No truncation made.');
       return output;
     if(output.length > capLength){
         if(output[capLength-1] === ' '){ 
   ...
   

2. truncate(len = 50)

   String.prototype.truncate = function(len = 50){
     var regx = new RegExp('^.{0,'+ len +'}[\S]*')
     var matches_array = this.match(regx);
     var str_length = matches_array[0].length;
     var replacement = matches_array[0].replace(/\s$/,'');
     return ((str_length > this.length) ? (replacement) : (replacement + "...") )
   

3. truncate(length)

   String.prototype.truncate = function(length) {
     return this.substr(0, length - 1) + (this.length > length? '...' : '');
   

4. truncate(length)

   String.prototype.truncate = function(length) {
     if (length == null) 
       length = 30;
     if (this.length > length) {
       content = this.substring(0, length);
       content += '?';
     } else {
       content = this  
     return content; 
   };
   var viewingMode;
   

5. truncate(length)

   String.prototype.truncate = function(length) {
     length = typeof length !== 'undefined' ? length : 100;
     if (this.length > length) {
       var str = this.substring(0, length);
       str = str.substring(0, Math.min(str.length, str.lastIndexOf(" ")));
       str = str + " ...";
       return str;
     } else {
       return this;
   ...
   

6. truncate(length, truncation)

   String.prototype.truncate = function(length, truncation) {
     length = length || 30;
     truncation = truncation === undefined ? '...' : truncation;
     return this.length > length ?
       this.slice(0, length - truncation.length) + truncation : String(this);
   };
   

7. truncate(length, truncation)

   String.prototype.truncate = function(length, truncation) {
       length = length || 30;
       truncation = (typeof truncation == 'undefined') ? '…' : truncation;
       return this.length > length
           ? this.slice(0, length) + truncation
           : this;
   };
   

8. truncate(length, useWordBoundary)

   String.prototype.truncate = function(length, useWordBoundary) {
       var toLong = this.length > length,
       s_ = toLong ? this.substr(0, length - 1) : this;
       s_ = useWordBoundary && toLong ? s_.substr(0, s_.lastIndexOf(' ')) : s_;
       return toLong ? s_ + '…' : s_;
   };
   

9. truncate(max_len, appender)

   'use strict';
   String.prototype.truncate = function(max_len, appender) {
     max_len  = max_len || 80;
     appender = appender || '...';
     if (appender.length >= max_len) {
       throw Error('appender length is greater or equal to max_len');
     if (this.length <= max_len) {
       return this;
   ...