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The behavior we require to implement a pair is that it glues two values together. Stated as a behavior condition,

  • If a pair p was constructed from values x and y , then select(p, 0) returns x , and select(p, 1) returns y .
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2.2 Data Abstraction
ew can be applied broadly, including to the pair values that we used to implement rational numbers. We never actually said much about what a pair was, only that the language supplied the means to create and manipulate lists with two elements. <span>The behavior we require to implement a pair is that it glues two values together. Stated as a behavior condition, If a pair p was constructed from values x and y , then select(p, 0) returns x , and select(p, 1) returns y . We don't actually need the list type to create pairs. Instead, we can implement two functions pair and select that fulfill this description just as well as a two-element list.


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