RosettaCodeData/Task/Apply-a-callback-to-an-array/Guish/apply-a-callback-to-an-array.guish

# applies add2 (adds 2) to each element
add2 = {
    return add(@1, 2)
}
l = {1, 2, 3, 4, 5, 6, 7}
puts each(add2, flat(@l))