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Mar 28th, 2017
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  1. function flat(array) {
  2. var ret = [];
  3. array.forEach(function (item) {
  4. if (Array.isArray(item)) {
  5. ret = ret.concat(flat(item));
  6. } else {
  7. ret.push(item);
  8. }
  9. });
  10. return ret;
  11. }
  12.  
  13. var inputArray = [[1,2,[3]],4];
  14.  
  15. alert(flat(inputArray));
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