Nodejs Array Subset isSubsetOf(comparisonArray)

Method Source Code

Array.prototype.isSubsetOf = function(comparisonArray) {
  // taking one array and comparing it to another
  // look at each element

  // iterate over first array
  for (var i = 0; i < this.length; i++) {
    // use indexOf to look if the element of first array is not found then return false
    if (comparisonArray.indexOf(this[i]) === -1) {
      return false;
    }/*from w w w. java2s . com*/
  }

  // else if not false. then it must have been found
  // so return true
  return true;
};

Related

1. isSubsetOf(array)

   Array.prototype.isSubsetOf = function (array) {
     var subset    = this;
     var subsetLen = subset.length;
     var supersetLen = array.length;
     var first, found;
     if ( subsetLen > supersetLen ) return false;
     if ( subsetLen === 0 && supersetLen >= 0 ) return true;
     first = subset[0];
     found = array.indexOf( first );
   ...
   

2. 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;
   };
   

3. 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;
   

4. 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;
   ...
   

5. 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;
   };
   ...
   

6. isSubsetOf(input)

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

7. isSubsetOf(input)

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

8. 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;
   };
   

9. 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;
   };
   ...