Function ArgumentsYou 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} |