Nodejs Array Convert toUniqueDictionary(key)

Method Source Code

Array.prototype.toUniqueDictionary = function(key) {
   if (!key)/*from  w  ww  .  j  av  a2 s .  com*/
      key = function(x) { return x.id; };

   var dictionary = {};
   this.forEach(function(item) {
      var currentKey = key(item);
      if (!currentKey)
         return true;
      dictionary[currentKey] = item;
   });
   return dictionary;
};

Related

1. toSet()

   Array.prototype.toSet = function () {
       var temp = [];
       this.forEach(function (e) {
           if (temp.indexOf(e) === -1)
               temp.push(e);
       });
       return temp;
   

2. toSet()

   Array.prototype.toSet = function(){
     var set = [];
     for (var i=0; i<this.length; i++){
       if (!set.contains(this[i])){
         set.push(this[i]);
     return set;
   

3. toSource(seen)

   Array.prototype.toSource = function(seen){
     var source, i = 0, j = this.length;
     seen = seen || [this];
     source = '[';
     for(;i<j;i++){
       source+= Object.sourceOf(this[i], seen, '[]');
       if( i < j - 1 ) source+= ', ';
     source+= ']';
   ...
   

4. toStrGen(originStr)

   Array.prototype.toStrGen=function(originStr){
     if(Object.prototype.toString.call(originStr).slice(8,-1)==="Array"){
       return this.map(function(i){
         return originStr.join(i);
       }).reduce(function(m,n){return m+n+'\b'}, "");
   };
   

5. toUnique()

   Array.prototype.toUnique = function() {
       var dict = {},
           arrayLength = this.length,
           elem,
           i,
           key,
           uniqueArray = [];
       for (i = 0; i < arrayLength; i++) {
           elem = this[i];
   ...
   

6. toUpper()

   Array.prototype.toUpper = function() {
     return this.map(function(x) { return x.toUpperCase(); });
   

7. to_frequency()

   Array.prototype.to_frequency = function(){
     hashed_picks = {}
     for (var i = 0; i < this.length; i++){
       pick = this[i].toString()
       if (hashed_picks[pick] == undefined){
         hashed_picks[pick] = 1
       }else{
         hashed_picks[pick]++
     return hashed_picks
   

8. to_s()

   Array.prototype.to_s = function(){return this.join('');};