具有最大参数数量的 Ruby 方法

Question

我有一个方法，它应该接受最多 2 个参数。它的代码是这样的:

def method (*args)
  if args.length < 3 then
    puts args.collect
  else
    puts "Enter correct number of  arguments"
  end
end

有没有更优雅的方式来指定它？

Answer 1

您有多种选择，具体取决于您希望方法的冗长和严格程度。

# force max 2 args
def foo(*args)
  raise ArgumentError, "Too many arguments" if args.length > 2
end

# silently ignore other args
def foo(*args)
  one, two = *args
  # use local vars one and two
end

# let the interpreter do its job
def foo(one, two)
end

# let the interpreter do its job
# with defaults
def foo(one, two = "default")
end