ScriptdrillTranspose a matrix
A JavaScript exercise from Scriptdrill. Solve it with a code editor in your browser that runs your function against example and hidden tests, and it is checked the moment you submit.
The task
`matrix` is an array of rows, all of the same length. Return the transposed matrix: the first column becomes the first row, the second column the second row, and so on. A matrix with no rows, or whose rows are empty, returns `[]`. Values are copied as they are, including `null` and `undefined`. Do not change the input.
What this exercise teaches
Reading matrix[0] for the width must come after the empty check, because matrix[0] is undefined when there are no rows. Mapping over matrix with the same index on both sides only works for square matrices.
A hint if you get stuck
The number of result rows is the length of the first input row. Build result row `j` by mapping over the input rows and taking `row[j]` from each.
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