Comments on: Hash key rewrite http://www.dweebd.com/ruby/hash-key-rewrite/ Web Freshness Mon, 05 Jul 2010 23:44:57 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: Bill Burcham http://www.dweebd.com/ruby/hash-key-rewrite/comment-page-1/#comment-209 Bill Burcham Fri, 17 Oct 2008 15:03:22 +0000 http://www.dweebd.com/?p=56#comment-209 Oh yeah. For folks who want to find more of these in the wild, here's a TextMate regexp that will find all injects that use argument decomposition: inject.*[|][^|(\n]*[(][^)|\n]+[)][^|\n]*[|] That makes sense when injecting on anything whose each method yields an array and Hash is a real common one (yielding [key,value]). Oh yeah. For folks who want to find more of these in the wild, here’s a TextMate regexp that will find all injects that use argument decomposition:

inject.*[|][^|(\n]*[(][^)|\n]+[)][^|\n]*[|]

That makes sense when injecting on anything whose each method yields an array and Hash is a real common one (yielding [key,value]).

]]> By: duncanbeevers http://www.dweebd.com/ruby/hash-key-rewrite/comment-page-1/#comment-207 duncanbeevers Wed, 15 Oct 2008 16:02:50 +0000 http://www.dweebd.com/?p=56#comment-207 A block passed to inject takes two arguments. The first is the accumulator, and the second is the element of the enumerable being injected (or <a href="http://en.wikipedia.org/wiki/Foldl" rel="nofollow">folded</a>.) The decomposition in this case occurs in the second argument of the inject block, which instead of assigning the enumerable element to a single block-local variable, instead decomposes the Hash tuple (key, value) to two discrete locals. Neat! A block passed to inject takes two arguments. The first is the accumulator, and the second is the element of the enumerable being injected (or folded.)

The decomposition in this case occurs in the second argument of the inject block, which instead of assigning the enumerable element to a single block-local variable, instead decomposes the Hash tuple (key, value) to two discrete locals. Neat!

]]> By: Bill Burcham http://www.dweebd.com/ruby/hash-key-rewrite/comment-page-1/#comment-206 Bill Burcham Wed, 15 Oct 2008 14:26:56 +0000 http://www.dweebd.com/?p=56#comment-206 That's a beautiful method. Which part is the "argument decomposition" part? I Googled for "ruby argument decomposition" about all I get is this very post! That’s a beautiful method. Which part is the “argument decomposition” part? I Googled for “ruby argument decomposition” about all I get is this very post!

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