FAQ: Functions - Functions After Returns

This community-built FAQ covers the “Functions After Returns” exercise from the lesson “Functions”.

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FAQs on the exercise Functions After Returns

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function trickyReturns(input)
  if input then
    return "foo!"
-- Below 
  if 2+2 == 4 then
    return "boo!"


Why is the output in this case “a c d”, when the expression “2+2 == 4” is true, and the condition only works with true?

If the condition of an if statement evaluates to true, then the statements of the if block are executed. If the condition evaluates to false, the statements of the if block are skipped.

Since 2 + 2 == 4 evaluates to true, so so the statements in the block are executed.
If the condition was 2 + 2 == 5, the statements in the if block would be skipped.

If the function call was amended to:


then the output would be:


(the strings "a", "c" and "d" being printed by the trickyReturns method. The print statement outside the method prints the string "boo!" because that is the value returned by the trickyReturns method)

If the method call was:


then the output would be:

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