Nodejs Array Subset isSubsetOf(input)

Method Source Code

/*************************************************************
Make an array method that can return whether or not a context 
array is a subset of an input array. To simplify the problem, 
you can assume that both arrays will contain only strings.
**************************************************************/

Array.prototype.isSubsetOf = function(input) {
    //w w  w  .j a  v  a  2  s .c o  m
  var freq = {};
  for (var i = 0; i < this.length; i++) {
    freq[this[i]] = 1;
  }

  for (var j = 0; j < input.length; j++) {
    if (freq[input[j]]) {
      delete freq[input[j]];
    }
  }

  return Object.keys(freq).length === 0;
};

Related

1. isSubsetOf(array)

   var a = ['commit', 'push'];
   var b = ['merge', 'reset', 'reset'];
   Array.prototype.isSubsetOf = function (array) {
     for (var i = 0; i < this.length; i++) {
       if (array.indexOf(this[i]) === -1) {
         return false;
     return true;
   ...
   

2. isSubsetOf(bigArray)

   Array.prototype.isSubsetOf = function(bigArray) {
     var uniqueSub = this.unique();
     var uniqueBig = bigArray.unique();
     var status = true;
     this.forEach(function(item) {
       if(bigArray.indexOf(item) === -1) status = false;
     });
     return status;
   };
   ...
   

3. isSubsetOf(comparisonArray)

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

4. isSubsetOf(input)

   Array.prototype.isSubsetOf = function(input) {
     var isSub = true;
     this.forEach(function (el) {
       if (!input.includes(el)) {
         isSub = false;
     });
     return isSub;
   };
   ...
   

5. isSubsetOf(input)

   Array.prototype.isSubsetOf = function(input){
     let result = true;
     this.forEach(item => input.indexOf(item) !== -1 ? result = result && true : result = false);
     return result;
   

6. isSubsetOf(inputArray)

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

7. isSubsetOf(inputArray)

   Array.prototype.isSubsetOf = function(inputArray) {
     for (var i = 0; i < this.length; i++) {
       var contains = false;
       for (var j = 0; j < inputArray.length; j++) {
         if (inputArray[j] === this[i]) {
           contains = true;
       if (!contains) {
   ...
   

8. isSubsetOf(matchArr)

   Array.prototype.isSubsetOf = function (matchArr) {
     var arr = this;
     for (var i = 0; i < arr.length; i++) {
       if (matchArr.indexOf(arr[i]) === -1 && typeof arr[i] !== 'object') {
         return false;
     return true;
   };
   ...
   

9. isSubsetOf(subset)

   'use strict';
   Array.prototype.isSubsetOf = function(subset){
     var arr = this;
   };