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Conventional wisdom in Ruby is to use do/end to delimit blocks which contain more than one line of code, and braces for one-line blocks. I've always tended to loosely follow this advice. Thanks to ruby-talk, I just became aware of Jim Weirich's suggestion to use braces for blocks when the value is being used, and do/end for blocks which are primarily sequences of statements. Jim actually posted this over three years ago, and Joe O'Brien brought it up more recently. On the whole, I like this idea and will probably adopt it to tune my use of do/end vs. braces.