Converting lodash _.uniqBy() to native javascript

Question

Here in this snippet i am stuck as in _.uniqBy(array,iteratee),this

• iteratee can be a function or a string at the same time

Answer 1

You could use a sort ordered by name and a filter based on the neighborhood comparison like this :

var sourceArray = [ { id: 1, name: 'bob' },
  { id: 1, name: 'bill' },
  { id: 1, name: 'bill' } ,
  {id: 2,name: 'silly'},
  {id: 2,name: 'billy'}]

var uniqBy = (inputArray, callback) => inputArray.sort((a,b) => callback(a) > callback(b))
.filter((x,i,arr) => i === arr.length -1 ? true : callback(x) !== callback(arr[i+1]));
var inputFunc = item => item.name;


var destArray = uniqBy(sourceArray, inputFunc)
console.log('destArray', destArray)