method

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v2_6_3 - Show latest stable - 0 notes - Class: Method

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What's this?

<<(p1) public

Returns a proc that is the composition of this method and the given g. The returned proc takes a variable number of arguments, calls g with them then calls this method with the result.

def f(x)
  x * x
end

f = self.method(:f)
g = proc {|x| x + x }
p (f << g).call(2) #=> 16

Show source

static VALUE
rb_method_compose_to_left(VALUE self, VALUE g)
{
    VALUE proc = method_to_proc(self);
    return proc_compose_to_left(proc, g);
}

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