Citrusbyte.babel_es2015_compiled.js

"use strict";

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); }

var _flatten = function _flatten(_ref) {
  var _ref2 = _toArray(_ref),
      zeroIndex = _ref2[0],
      rest = _ref2.slice(1);

  if (zeroIndex === undefined) return [];else if (!Array.isArray(zeroIndex)) return [zeroIndex].concat(_toConsumableArray(_flatten(rest)));else return [].concat(_toConsumableArray(_flatten(zeroIndex)), _toConsumableArray(_flatten(rest)));
};

_flatten([1, 2, [3, 4, [5], 6, [7, [8]]]]);

Citrusbyte.js

/**
    Task: 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]
    Spec: Production ready code
**/

const _flatten = ([zeroIndex, ...rest]) => {
  if ( zeroIndex === undefined ) return [];
  else if ( !Array.isArray( zeroIndex ) ) return [ zeroIndex, ..._flatten(rest) ];
  else return [ ..._flatten( zeroIndex ), ..._flatten( rest ) ];
}

_flatten([1,2,[3,4,[5],6,[7,[8]]]]);