Nodejs Array Convert toDictionary(key)

Method Source Code

Array.prototype.toDictionary = function(key) {
   if (!key)/*w  w w  .ja v  a  2s.co  m*/
      key = function(x) { return x.id; };

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

Related

1. toArray()

   Array.prototype.toArray = function() {
     return this.clone();
   };
   

2. toArray(obj, start)

   Array.toArray = function(obj, start) {
      return Array.prototype.slice.call(obj, start); 
   };
   

3. toArrayInt()

   Array.prototype.toArrayInt = function () {
       for (var i=0; i<this.length;i++) {
           this[i] = parseInt(this[i]);
       return this;
   };
   

4. toColor()

   Array.prototype.toColor = function() {
     var n = this.length <= 3 ? 3 : 4;
     var pieces = this.concat( [0,0,0,0] ).slice(0,n);
     if (!this.length) {
       return "rgb(" + pieces.join() + ")";
     } else if (this.length <= 3) {
       return "rgb(" + pieces.join() + ")";
     } else if (this.length >= 4) {
       return "rgba(" + pieces.join() + ")";
   ...
   

5. toCommaSeparatedString()

   Array.prototype.toCommaSeparatedString = function() {
     if (this.length > 0) {
       if (this.length == 1) {
         return "" + this[0];
       } else {
         var buf = new StringBuilder();
         for ( var i = 0; i < this.length; i++) {
           if (i > 0) {
             buf.append(",");
   ...
   

6. toDictionary(keySelector, valueSelector)

   Array.prototype.toDictionary = function (keySelector, valueSelector) {
     var o = {};
     var l = this.length;
     while (l-- > 0) {
       var key = keySelector(this[l]);
       if (key == null || key == "") continue;
       o[key] = valueSelector(this[l]);
     return o;
   ...
   

7. toFormat(spec)

   Array.prototype.toFormat = function (spec) {
     var buffer = [];
     for (var i = 0, len = this.length; i < len; i++) {
       buffer[i] = Jitsi.format(spec, this[i]);
     return buffer.join('');
   };
   

8. toForty()

   Array.prototype.toForty = function () {
     for (var i = 1; i < 41; i++) {
       this.push(i);
     return this;
   },
   

9. toForty()

   Array.prototype.toForty = function(){
       var start = 2;
       var end = 40;
       for(var i = start; i <= end; i += 2){
           this.push(i);
      return this;
   var oneToForty = [].toForty();
   ...