Nodejs Array Subset isSubsetOf(input)

Method Source Code

// determines if an array is a subset of another array
Array.prototype.isSubsetOf = function(input) {
  var isSub = true;

  this.forEach(function (el) {
    if (!input.includes(el)) {
      isSub = false;/*from w w  w .  jav  a  2 s  .  c  o m*/
    }
  });
  return isSub;
};

Related

1. isSubsetOf(array)

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

2. isSubsetOf(array)

   Array.prototype.isSubsetOf = function(array) {
     function arrayContains(array, item) {
       for (var i = 0; i < array.length; i++) {
         if (array[i] === item) {
           return true;
       return false;
     for (var i = 0; i < this.length; i++) {
       if (!arrayContains(array, this[i])) {
         return false;
     return true;
   

3. 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;
   ...
   

4. 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;
   };
   ...
   

5. 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;
   };
   

6. isSubsetOf(input)

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

7. isSubsetOf(input)

   Array.prototype.isSubsetOf = function(input) {
     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;
   };
   

8. 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;
   };
   ...
   

9. 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) {
   ...