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showing results for - " keys 28 29 array"
Gregory
24 Nov 2020
1var arr = ['a', , 'c'];
2var sparseKeys = Object.keys(arr);
3var denseKeys = [...arr.keys()];
4console.log(sparseKeys); // ['0', '2']
5console.log(denseKeys); // [0, 1, 2]
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