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a guest Sep 16th, 2019 79 Never
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  1. const toFlat = (flat, toFlatten) => flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
  2.  
  3. const flatten = (arr) => arr.reduce(toFlat, []);
  4.  
  5. /**
  6. * to use
  7. * const flat = flatten([1,[2,3,[4,5,6],7],8]);
  8. */
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