A Simple Conditional: IF

• You can use IF for a simple if-then-else test

  • E.g.,
    (if (number? x) x
    
    (list x))
    

• IFs can be nested, but then a COND may be better

  • E.g.,
    (if (null? x) NIL
    
    (if (number? x) x
    (list x)))

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