[javascript] Transposing a 2D-array in JavaScript

ES6 1liners as :

let invert = a => a[0].map((col, c) => a.map((row, r) => a[r][c]))

so same as Óscar's, but as would you rather rotate it clockwise :

let rotate = a => a[0].map((col, c) => a.map((row, r) => a[r][c]).reverse())

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