Requirement: "Write some code, that will flatten an array of arbitrarily nested arrays of integers into a flat array of integers. e.g. [[1,2,[3]],4] -> [1,2,3,4]. Your solution should be a link to a gist on gist.github.com with your implementation. When writing this code, you can use any language you're comfortable with. The code must be well te…

flatten.js

// Written in Javascript (ES2015)
const flatten = arg => 
  typeof arg === 'number' ? [arg] :
  typeof arg === 'object' && Array.isArray(arg) ?
    arg.reduce(
      (result, element) => result.concat(flatten(element))
    , []) :
    [];