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Copyright (c) 2011-2012 Yutaka Saito

### Function Arguments You can specify optional arguments, default values and variable-length arguments for function declarations.
    f1(a, b?, c?) = printf('%s, %s, %s\n', a, b, c)
    f1(2)                                # 2, nil, nil

    f2(a, b = 10, c => 'abc') = printf('%s, %s, %s\n', a, b, c)
    f2(2)                                # 2, 10, abc

    f3(a, b, c*) = printf('%s, %s, %s\n', a, b, c):nomap
    f3(2, 3, 4, 5, 6, 7)                 # 2, 3, [4, 5, 6, 7]
    f3(2, 3)                             # 2, 3, []

    f4(a, b, c+) = printf('%s, %s, %s\n', a, b, c):nomap
    f4(2, 3, 4, 5, 6, 7)                 # 2, 3, [4, 5, 6, 7].
    f4(2, 3)                             # error. c has to get at least one value.
When calling a function, you can specify each argument value by a keyword. A keyword shall be associated with its value with dictionary assignment operator =>.
    g1(a, b, c) = printf('%s, %s, %s\n', a, b, c)
    g1(2, b => 3, c => 4)                # 2, 3, 4
If the argument declaration list contains a symbol suffixed by percent character (%), the symbol shall be assigned with a dictionary consisting of pairs of keywords and values that have not matched the argument list.
    g2(a, b, dict%) = printf('%s, %s, %s\n', a, b, dict)
    g2(2, b => 3, c => 4, d => 5)        # 2, 3, %{c => 4, d => 5}
    g2(2, 3, c => 4, d => 5)             # 2, 3, %{c => 4, d => 5}