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Line 7:
Line 7: + + + + + +
→Array.diagonal(nthDiagonalIndex)
Extract the diagonal at nthDiagonalIndex (-ve for diagonals below the proper diagonal, and zero for the proper diagonal).
Extract the diagonal at nthDiagonalIndex (-ve for diagonals below the proper diagonal, and zero for the proper diagonal).
|4|.diagonal(0..2)
|4|.diagonal(0)
|4|.diagonal(-1..1)