from toolz import curry


@curry
def concat(xs, ys):
    """Returns the result of concatenating the given lists or strings.
Note: R.concat expects both arguments to be of the same type,
unlike the native Array.prototype.concat method. It will throw
an error if you concat an Array with a non-Array value.
Dispatches to the concat method of the first argument, if present.
Can also concatenate two members of a fantasy-land
compatible semigroup"""
    return xs + ys
