Languages in which arrays are objects, including JavaScript, implement a two-dimensional array as an array of arrays, so separate brackets must be used for the subscripts.

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Quizplus · Accepted Answer

In languages like JavaScript, where arrays are treated as objects, a two-dimensional array is indeed implemented as an array of arrays. This means that to access elements, separate brackets are used for each level of the array (e.g., array[i][j] for the element in the ith row and jth column).

Languages in Which Arrays Are Objects, Including JavaScript, Implement a Two-Dimensional