instance method
Method#<<
(::Proc::_Callable g) -> ::Proc
self << g → a_proc
proc.c
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static VALUE
rb_method_compose_to_left(VALUE self, VALUE g)
{
g = to_callable(g);
self = method_to_proc(self);
return proc_compose_to_left(self, g);
}
Returns a proc that is the composition of the given g and this method.
The returned proc takes a variable number of arguments. It first calls g with the arguments, then calls self with the return value of g.
Example
def f(ary) = ary << 'in f' f = self.method(:f) g = proc { |ary| ary << 'in proc' } (f << g).call([]) # => ["in proc", "in f"]