12-letter words containing y, n
- call-by-name — (reduction) (CBN) (Normal order reduction, leftmost, outermost reduction). An argument passing convention (first provided by ALGOL 60?) where argument expressions are passed unevaluated. This is usually implemented by passing a pointer to a thunk - some code which will return the value of the argument and an environment giving the values of its free variables. This evaluation strategy is guaranteed to reach a normal form if one exists. When used to implement functional programming languages, call-by-name is usually combined with graph reduction to avoid repeated evaluation of the same expression. This is then known as call-by-need. The opposite of call-by-name is call-by-value where arguments are evaluated before they are passed to a function. This is more efficient but is less likely to terminate in the presence of infinite data structures and recursive functions. Arguments to macros are usually passed using call-by-name.
- call-by-need — (reduction) A reduction strategy which delays evaluation of function arguments until their values are needed. A value is needed if it is an argument to a primitive function or it is the condition in a conditional. Call-by-need is one aspect of lazy evaluation. The term first appears in Chris Wadsworth's thesis "Semantics and Pragmatics of the Lambda calculus" (Oxford, 1971, p. 183). It was used later, by J. Vuillemin in his thesis (Stanford, 1973).
- empty-nester — a married person whose children have grown up and left home
- fly-by-night — not reliable or responsible, especially in business; untrustworthy: a fly-by-night operation.
- forty-niners — a person, especially a prospector, who went to California in 1849 during the gold rush.
- nighty-night — good night
- ninety-ninth — next after the ninety-eighth; being the ordinal number for 99.
- seventy-nine — a cardinal number, 70 plus 9.
- snotty-nosed — child: runny nose
- thirty-ninth — next after the thirty-eighth; being the ordinal number for 39.
- twenty-ninth — next after the twenty-eighth; being the ordinal number for 29.
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