From: "David A. Black" <dblack@...>
Date: 2010-06-07T09:55:58+09:00
Subject: Re: inject method of Array class

Hi --

On Mon, 7 Jun 2010, Rein Henrichs wrote:

> In addition to the previously mentioned difference between #methods and 
> #instance_methods, #inject is actually a method on the Enumerable module, 
> which is mixed into Array (and other classes that have #each). The Enumerable 
> module is full of methods that can be used on "things that can enumerate 
> themselves", like Arrays, Hashes and Sets.

Although a surprising (to me) number of Enumerable's instance methods
are overridden in Array:

irb(main):008:0> (Array.instance_methods(false) &
Enumerable.instance_methods).sort
=> ["collect", "count", "cycle", "drop", "drop_while", "find_index",
"first", "include?", "map", "reject", "reverse_each", "select",
"sort", "take", "take_while", "to_a", "zip"]

(That's 1.8.7 but the list is the same in 1.9.1.)


David

-- 
David A. Black, Senior Developer, Cyrus Innovation Inc.

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