NLI: Function: if

Background: NLI, Expressions, Functions
Related: Examples

The if function executes expressions based on a condition. If the condition evaluates to anything, then the first expression is executed, else the second expression is executed. The second expression is optional.

General Format:
(if condExpr thenExpr [elseExpr])

(; If john likes mary, then mary likes john)
(if (get john like mary)
    (set mary like john)

(; If john is a doctor, then set him to like golf and hate cartoons)
(if (get doctor instance john)
        (set john like golf)
        (set john hate cartoons)

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