Difference between two arrays in javascript

Votes : 5
532

There is few methods to get difference to other one between two arrays in javascript.

<script>Array.prototype.es_diff = function(e) { /* * Get difference between two array * * @param (array|required) e - array * @return (array) Difference between two array */ return this.filter(function(i) {return e.indexOf(i) < 0;});
};</script>

This sample code method is very simple. Use javascript filter() function to filter first array. Then try to get values one by one from first array and find out witch values have been already exist on second array. Return first array values, witch are not contain in second array.

Example:

console.log([1,2,3].es_diff([1,2])); output:/ [3]

console.log([1,2,3].es_diff([1,2,4])); output:/ [3]

console.log([1,2,3,3].es_diff([1,2])); output:/ [3,3]

console.log([1,2,3].es_diff([1,2,3])); output:/ []

console.log([1,2,2,3].es_diff([1,2])); output:/ [3]

<script>Array.prototype.esdiff = function(e) {
  /*
   * Get difference between two array
   * 
   * @param (array|required) e - array  
   * @return (array) Difference between two array
   */
   var tmp = {}, diff =[],args =  this || [];  
   for(i in e){
       switch(typeof e[i]){
           case 'function':  break;
           default: tmp[e[i]] = 1; break;
       } 
   }  
   for(i in args) {
         switch (typeof args[i]) {
             case 'function': break;
             default: 
                 if (!tmp.hasOwnProperty(args[i]) && diff.indexOf(args[i])) {
                     diff.push(args[i]);     
                 } 
                 break;
         } 
     }
    return diff;
 };</script>

This sample code method result are look like to first method's result. But it will be removed duplicate values on the result.

Example:

console.log([1,2,3,10].esdiff([1,2])); output:/ [3, 10]

console.log([1,2,3].esdiff([1,2])); output:/ [3]

console.log([1,2,3].esdiff([1,2,4])); output:/ [3]

console.log([1,2,3,3].esdiff([1,2])); output:/ [3]

console.log([1,2,3].esdiff([1,2,3])); output:/ []

console.log([1,2,2,3].esdiff([1,2])); output:/ [3]

<script>Array.prototype.ESDetails = function(e) {
   /*
    * Get difference between two array
    * 
    * @param (array|required) e - array  
    * @return (array) Difference between two array
    */
    var tmp1 = {},tmp2 = {}, diff ={first:[],common:[],second:[]},args =  this || [];  
    for(i in e){
       switch(typeof e[i]){
           case 'function':  break;
           default:
               tmp1[e[i]] = e[i]; 
            break;
       } 
   }  
   for(i in args) {
        switch (typeof args[i]) {
             case 'function': break;
             default:  
                 if(!tmp1.hasOwnProperty(args[i])){
                     if( diff.first.indexOf(args[i])){
                         diff.first.push(args[i]); 
                     }  
                 }else{
                      if( diff.common.indexOf(args[i])){
                         diff.common.push(args[i])
                     }
                 }  
                 tmp2[args[i]] = 1; 
                 break;
        } 
     }
     for(i in tmp1){
           if(!tmp2.hasOwnProperty(i)){
                diff.second.push(tmp1[i]); 
           }
     }
    return diff;
};</script>

The sample code is complexes than previous methods. The result will be contain differences between two arrays, separately and also common values between two arrays.

Example:

console.log([1,2,3].ESDetails([1,2])); output:/ {common:[1, 2],first:[3],second:[]}

console.log([1,2,3].ESDetails([1,2,4])); output:/ {common:[1, 2],first:[3],second:[4]}

console.log([1,2,3,3].ESDetails([1,2])); output:/ {common:[1, 2],first:[3],second:[]}

console.log([1,2,3].ESDetails([1,2,3])); output:/ {common:[1, 2,3],first:[],second:[]}

console.log([1,2,2,3].ESDetails([1,2])); output:/ {common:[1, 2,2],first:[3],second:[]}

asked 4 months,13 days ago

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