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case.md

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case

case implements the common switch/case pattern: The function expects an even number of expressions and will sequentially process them in pairs. If the first expression yields true, case will return the second expression. Otherwise the next pair is checked. If none of the pairs match, case returns null.

Examples

  • (case true 1 false) ➜ invalid
  • (case true 1 false 2) ➜ 1
  • (case false 1 true 2) ➜ 2
  • (case false 1 (eq? 1 2) 2) ➜ null

Forms

(case exprs:expression…) ➜ any

  • exprs is an even number of expressions.