Nodejs Array Subset isSubsetOf(array)

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(array) {
  for(var i = 0; i < this.length; i++){
    if(array.indexOf(this[i])===-1){
      return false
    }/*from   w  ww  .  j  a v a 2 s .c  om*/
  }
  return true;
};

Related

1. isSubsetOf(arr)

   Array.prototype.isSubsetOf = function (arr) {
     var objectify = function(arr) {
       var obj = {};
       for (var i = 0; i < arr.length; i++) {
         obj[arr[i]] = true;
       return obj;
     };
     var obj = objectify(arr);
   ...
   

2. isSubsetOf(arr)

   Array.prototype.isSubsetOf = function (arr) {
     let result = 0;
     for (let i = 0; i < this.length; i += 1) {
       for (let p = 0; p < arr.length; p += 1) {
         if (this[i] === arr[p]) {
           result += 1;
           break;
       if (i + 1 !== result) {
         return false;
     return true;
   };
   const b = ['merge','reset','reset']
   console.log(b.isSubsetOf(['reset','merge','add','commit']));
   const a = ['commit','push','blame'];
   console.log(a.isSubsetOf(['commit','rebase','push','blame']));
   

3. isSubsetOf(arr)

   Array.prototype.isSubsetOf = function (arr) {
     var subArr = this;
     var words = {};
     for (var i = 0; i < arr.length; i++) {
       if (!words[arr[i]]) {
         words[arr[i]] = true;
     for (var i = 0; i < subArr.length; i++) {
   ...
   

4. isSubsetOf(arr)

   Array.prototype.isSubsetOf = function (arr) {
     var objectify = function (arr) {
       var obj = {};
       for (var i = 0; i < arr.length; i++) {
         obj[arr[i]] = true;
       return obj;
     };
     var obj = objectify(arr);
   ...
   

5. isSubsetOf(array)

   Array.prototype.isSubsetOf = function(array) {
     return this.reduce(function (acc, val) {
       if (acc) {
         return array.includes(val);
       return false;
     }, true)
   };
   

6. isSubsetOf(array)

   Array.prototype.isSubsetOf = function(array) {
     var isSubset = true;
     if(this.forEach(function(element){
       if(!array.includes(element)){
         isSubset = false;
     }));
     return isSubset;
   };
   ...
   

7. isSubsetOf(array)

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

8. isSubsetOf(array)

   Array.prototype.isSubsetOf = function(array) {
     var arr = this;
     var obj = {};
     for(var i=0; i<array.length; i++) {
       obj[array[i]] = true; 
     for(var i=0; i<arr.length; i++) {
       if(!(arr[i] in obj)) {
         return false;
   ...
   

9. 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 );
   ...