Nodejs Array Unique unique()

Method Source Code

/*//from   w w w .  j a  va  2s.co m

Bonfire: Mutations

Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array.

For example, ["hello", "Hello"], should return true because all of the letters in the second string are present in the first, ignoring case.

The arguments ["hello", "hey"] should return false because the string "hello" does not contain a "y".

Lastly, ["Alien", "line"], should return true because all of the letters in "line" are present in "Alien".

*/

Array.prototype.unique = function() {
    return this.reduce(function(accum, current) {
        if (accum.indexOf(current) < 0) {
            accum.push(current);
        }
        return accum;
    }, []);
};
function mutation(arr) {
  var a1 = arr[0].toLowerCase();
  var a2 = arr[1].toLowerCase();
  a1 = a1.split('');
  a2 = a2.split('');
  a1 = a1.sort();
  a2 = a2.sort();
  a1 = a1.unique();
  a2 = a2.unique();
  for (var i =0; i<a2.length;i++)
    {
      if (a1.indexOf(a2[i]) === -1)
        return false;
    }
  return true;
}

mutation(['Hello', 'HhelL']);

Related

1. unique()

   Array.prototype.unique = function() {
     var output = {};
     for (var key = 0; key < this.length; key++) {
       output[this[key]] = this[key];
     var results = [];
     for (key in output) {
       var value = output[key];
       results.push(value);
   ...
   

2. unique()

   Array.prototype.unique = function(){
       var temp = {};
       for (var i = 0; i < this.length; i++)
           temp[this[i]] = true;
       var r = [];
       for (var k in temp)
           r.push(k);
       return r;
   

3. unique()

   Array.prototype.unique = function () {
     var tmp = {}, result = [];
     for (var i = 0; i < this.length; i++) {
       if (!tmp[this[i]]) {
         result.push(this[i]);
         tmp[this[i]] = true;
     return result;
   ...
   

4. unique()

   var fs = require('fs');
   Array.prototype.unique = function() {
     var res = [],
       hash = {};
     for (var i = 0, elem;
       (elem = this[i]) != null; i++) {
       if (!hash[elem]) {
         res.push(elem);
         hash[elem] = true;
   ...
   

5. unique()

   Array.prototype.unique = function() {
       var newArr = [],
           origLen = this.length,
           found, x, y;
       for (x = 0; x < origLen; x++) {
           found = undefined;
           for (y = 0; y < newArr.length; y++) {
               if (this[x] === newArr[y]) {
                   found = true;
   ...
   

6. unique()

   Array.prototype.unique = function() {
       var a = this.concat();
       for(var i=0; i<a.length; ++i) {
           for(var j=i+1; j<a.length; ++j) {
               if(a[i] === a[j])
                   a.splice(j--, 1);
       return a;
   ...
   

7. unique()

   Array.prototype.unique = function()
       this.sort();
       var re=[this[0]];
       for(var i = 1; i < this.length; i++)
           if( this[i] !== re[re.length-1])
               re.push(this[i]);
   ...
   

8. unique()

   Array.prototype.unique = function() {
     var n = {},r=[];
     for(var i = 0; i < this.length; i++) {
       if ( this[i] && !n[this[i]]) {
         n[this[i]] = true;
         r.push(this[i]);
     return r;
   ...
   

9. unique()

   Array.prototype.unique = function () {
     var obj,
       result = [];
     for (var i = 0, l = this.length; i < l; ++i) {
       obj = this[ i ];
       if ( result.indexOf( obj ) < 0 ) {
         result[ result.length ] = obj;
     return result;
   };