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- RA.isSparseArray(new Array(3)); // => true
- RA.isSparseArray([1,,3]); // => true
- const list = [1, 2, 3];
- delete list[1];
- RA.isSparseArray(list); // => true
- RA.isSparseArray([1, 2, 3]); // => false
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