In programming, particularly in the context of functional programming and certain languages like Haskell and JavaScript, the term "strict function" has a specific meaning. A strict function is a function that evaluates its arguments before executing its body. In other words, a strict function demands that its arguments must be fully determined before the function is applied.
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A function is strict in an argument if replacing that argument by the bottom value makes the result bottom. This semantic property does not prescribe evaluation order: a function that always diverges is strict without inspecting its argument. Strictness of a structured argument also does not mean evaluation of every component.[ref]