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Smalltalk Blocks

• A sequence of statements, separated by periods, delimited by brackets

      [index <- index + 1. sum <- sum + index]
  

• A block specifies something, but doesn't do it

• To request the execution of a block, send it the unary message, value

• e.g., [...] value

• If a block is assigned to a variable, it is evaluated by sending value to that variable

• e.g.,

      addIndex <- [sum <- sum + index]
          ...
      addIndex value