From: Brian Candler <b.candler@...>
Date: 2010-04-01T23:10:57+09:00
Subject: Re: Weird hash key: what am I asking Ruby to do?

Aldric Giacomoni wrote:
> So.. In the first example, the hash key is 'lambda { x } => 5' .
> What on earth does that even mean?

You can omit the hash braces in the last arg of a method call, i.e.

fn(a=>b, c=>d) is short for fn({a=>b, c=>d})

foo[bar] is also a method call. It's short for foo.[](bar)

irb(main):001:0> h = {}
=> {}
irb(main):002:0> h[1=>2] = 3
=> 3
irb(main):003:0> h
=> {{1=>2}=>3}
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