| Quite a bit of talk about Ruby, but I couldn't work out which message to follow up, so here is a new thread. According to Martin Fowler: Closures have been around for a long time. I ran into them properly for the first time in Smalltalk where they're called Blocks. Lisp uses them heavily. They're also present in the Ruby scripting language - and are a major reason why many rubyists like using Ruby for scripting. An interesting article. So we are finally catching up to ALGOL-60 (implemented by Burroughs as its systems programming language in 1962, and Don Knuth before that) with call-by-name parameters (aka thunks implemented by the NAMC and VALC machine instructions, with tagged OO architecture). No wonder C.A.R Hoare said Algol was a considerable improvement over most of its successors! Ian |
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