//Snippet of JavaScript code
let sparseArray = [5, , 3, , 1];
let denseArray = sparseArray.filter(() => true);
console.log(denseArray);
The filter function in the callback removes empty elements from the sparse array.
Output: [5, 3, 1]
Explanation:
Referencing the MDN documentation shared by Ry in the comments:
The function
callbackFnis called only for array indexes that have values assigned to them. Any empty slots in sparse arrays will not trigger the callback.
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