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Sep 19th, 2019
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  1. RA.isSparseArray(new Array(3)); // => true
  2. RA.isSparseArray([1,,3]); // => true
  3.  
  4. const list = [1, 2, 3];
  5. delete list[1];
  6. RA.isSparseArray(list); // => true
  7.  
  8. RA.isSparseArray([1, 2, 3]); // => false
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