Nodejs String Repeat firstRepeatLetter()

Method Source Code

// find the first not repeated character
// Sample arguments : 'abacddbec' 
// Expected output : 'e' 
String.prototype.firstRepeatLetter = function (){
   var letters = this.split("");
   var letterSet = new Set();
   letters.some( function(element, index) {
      // statements
      if ( !letterSet.has(element) ){
         letterSet.add(element);/*from   w  w w . j a va2s  . c o  m*/
      }
      else{
         console.log(element);
         return false;
      }
   });
}
"this is a test".firstRepeatLetter();

Related

1. repeat( count )

   String.prototype.repeat = function( count ) {
     var s = "";
     while( count > 0 ) {
       count--;
       s += this;
     return s;
   

2. repeat( num )

   String.prototype.repeat = function( num )
       return new Array( num + 1 ).join( this );
   

3. repeat( num )

   String.prototype.repeat = function( num ) {
     for( var i = 0, buf = ""; i < num; i++ ) buf += this;
     return buf;
   

4. repeat( num )

   SUBMIT_TIME_OUT = 10; 
   CONTEST_START_TIME = Date.UTC(2014, 4, 21, 3, 30, 0); 
   CONTEST_END_TIME = Date.UTC(2014, 4, 21, 9, 30, 0); 
   Tasks = new Meteor.Collection('ctf_tasks');
   Submits = new Meteor.Collection('submits');
   String.prototype.repeat = function( num ) {
       return new Array( num + 1 ).join( this );
   };
   getTimeInNiceFormat = function(t) {
   ...