Nodejs String Truncate truncate(length, useWordBoundary)

Method Source Code

/**/*from   w  w  w.  j ava  2  s. c o  m*/
 * Simple string truncate helper.
 *
 * @param   {number}    length
 * @param   {boolean}   useWordBoundary
 *
 * @returns {string}
 */
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_;
};

Related

1. 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;
   

2. 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;
   ...
   

3. truncate(length, 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()
   

4. 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);
   };
   

5. 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;
   };
   

6. 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;
   ...
   

7. truncate(maxlength)

   String.prototype.truncate = function (maxlength) {
       if (!this) {
           return '';
       if (!maxlength) {
           maxlength = 20;
       return (this.length > maxlength) ? this.slice(0, maxlength - 3) + '...' : this;
   };
   ...
   

8. truncate(n)

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

9. truncate(n)

   String.prototype.truncate = function(n) {
     var tooLong = this.length > n,
         string = tooLong ? this.substr(0,n-1) : this;
     string = tooLong ? string.substr(0,string.lastIndexOf(' ')) : string;
     return  tooLong ? string + '...' : string;
   };