Meshgrid on 2D #JavaScript #array

meshgrid2D.js

function meshgrid(xArray, yArray) {
    /*
     Here xArray, yArray should all be 1d arrays.
     Then it returns 2 fortran-style 2D arrays, that is,
     they are all column-major order:
     http://www.wikiwand.com/en/Row-_and_column-major_order.
     The returned xMesh and yMesh are all of shape [xNum, yNum].
     */
    let xNum = xArray.size;
    let yNum = yArray.size;
    let xMesh = reshape(tile(xArray, [yNum]), [xNum, yNum]);
    let yMesh = reshape(tile(yArray, [1, xNum]).transpose(1, 0), [xNum, yNum]);
    return [xMesh, yMesh];
}