Web Reference: That’s the key idea behind the environment model. In this model, there is a data structure called the dynamic environment, or just “environment” for short, that is a dictionary mapping variable names to values. Whenever the value of a variable is needed, it’s looked up in that dictionary. An example of how environment-model evaluation works. Substitution-model evaluation is list-like; environment-model, tree-like. ...more We'll concentrate in the rest of this chapter on the big-step version of the environment model. It would of course be possible to define a small-step version, too.
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