Nodejs Array Sub subset(field, criterion)

Method Source Code

Array.prototype.subset = function (field, criterion) {
   var arr = new Array();
   for (var i=0 ; i<this.length ; i++) {
      if(this[i][field] === criterion) {
         arr.push(this[i]);/*from  w  w  w . j a v a2 s  . c o  m*/
      }
   }
   return arr;
}

Related

1. allSubArrays(width)

   Array.prototype.allSubArrays = function allSubArrays(width) {
     var w = width;
     var allArr = [];
     var i;
     var len;
     if (w) {
       w = Math.min(w, this.length);
       for (i = 0, len = this.length - w + 1; i < len; ++i ) {
         allArr.push(this.slice(i, i + w));
   ...
   

2. listsub(array, sizediff)

   Array.prototype.listsub = function (array, sizediff) {
       if (!array)
           return null;
     var match = [];
       for (var i = 0; i < this.length; i++) {
           if (this[i].contains(array, sizediff)) {
               match.push(this[i]);
       return match;
   

3. sub(a2)

   Array.prototype.sub = function(a2) {
     var l1 = this.length;
     var l2 = a2.length;
     var len = (l1 < l2 ? l1 : l2);
     var result = new Array(len);
     for (var i = 0; i < len; i++) {
       result[i] = this[i] - a2[i];
     return result;
   ...
   

4. sub(other)

   Array.prototype.sub = function(other) {
       console.assert(this.length == other.length, 'sub: len(a) != len(b)');
       var ret = new Array(this.length);
       for(var i = 0; i < ret.length; i++)
           ret[i] = this[i] - other[i];
       return ret;
   

5. subList(start, end)

   Array.prototype.subList = function(start, end){
     return this.slice(start, end);
   

6. subsetOf(other)

   Array.prototype.subsetOf = function (other) {
     for (var i = 0; i < this.length; i += 1) {
       if (other.indexOf(this[i]) === -1)
         return false;
     return true;
   };