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@benjamingr benjamingr/sample.js
Created May 16, 2018

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function cleanUp (arr, max) {
const cnts = {} // keep track of what we find
return arr.reduce((a, i) => { // loop over the array index by index
cnts[i] = (cnts[i] || 0) + 1; // mark that I seen the number
if (cnts[i] <= max) { // check to see if we are under the max
return a.concat(i) //if we are, add it to an arry
return a // return the array for reduce
}, [])
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