antoniocsoares

// example
const list = {"you": 100, "me": 75, "foo": 116, "bar": 15};
Object
     .keys(list)
     .sort((a, b) => list[a]-list[b])
     .reduce((obj, key) => ({
         ...obj, 
         [key]: list[key]
       }), {})
// output

antoniocsoares

// ES6 

// Count duplicate items
const names = ['Mike', 'Matt', 'Nancy', 'Adam', 'Jenny', 'Nancy', 'Carl']

const count = names => 
  names.reduce((a, b) => 
    Object.assign(a, {[b]: (a[b] || 0) + 1}), {})

const duplicates = dict => 

antoniocsoares

// usage example:
const myArray = ['a', 1, 'a', 2, '1'];
const unique = myArray.filter((v, i, a) => a.indexOf(v) === i); 
// unique is ['a', 1, 2, '1']

// usage example:
const myArray = ['a', 1, 'a', 2, '1'];
const unique = [...new Set(myArray)]; 
// unique is ['a', 1, 2, '1']