Function copy

docs/app/js/sanddance-app.js:69878–69882

(out, a)

    return out;
}
function copy(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    return out;
}
function set(out, x, y) {
    out[0] = x;
    out[1] = y;