jquery - fastest way to group keys with the same numeric value from a javascript object? -


'lets have object 

var obj = {    apples: 2,    grapes: 1,    oranges:2,    carrots:2,    potatoes: 4 }

how write fast executing function return keys grouped values?

return {     "2": ['apples', 'oranges', 'carrots'],     "4" : ['potatoes'],     "1" : ['grapes']  }

you can use simple for..in achieve this:

var obj = {    apples: 2,    grapes: 1,    oranges:2,    carrots:2,    potatoes: 4 };  var result = {}; for(var key in obj) {    if(!(obj[key] in result)) result[obj[key]] = [];    result[obj[key]].push(key); }  console.log(result);

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