Get the element with the highest occurrence in an array

Question

I\'m looking for an elegant way of determining which element has the highest occurrence (mode) in a JavaScript array.

For example, in

[\'pear\', \'a         


        

Answer 1

As I'm using this function as a quiz for the interviewers, I post my solution:

const highest = arr => (arr || []).reduce( ( acc, el ) => {
  acc.k[el] = acc.k[el] ? acc.k[el] + 1 : 1
  acc.max = acc.max ? acc.max < acc.k[el] ? el : acc.max : el
  return acc  
}, { k:{} }).max

const test = [0,1,2,3,4,2,3,1,0,3,2,2,2,3,3,2]
console.log(highest(test))