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Ruby Programming
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Expanding Arrays in Method Calls

Earlier we saw that if you put an asterisk in front of a formal parameter in a method definition, multiple arguments in the call to the method will be bundled up into an array. Well, the same thing works in reverse.

When you call a method, you can explode an array, so that each of its members is taken as a separate parameter. Do this by prefixing the array argument (which must follow all the regular arguments) with an asterisk.

def five(a, b, c, d, e)
  "I was passed #{a} #{b} #{c} #{d} #{e}"
end
five(1, 2, 3, 4, 5 ) "I was passed 1 2 3 4 5"
five(1, 2, 3, *['a', 'b']) "I was passed 1 2 3 a b"
five(*(10..14).to_a) "I was passed 10 11 12 13 14"

Ruby Programming
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