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- function isEven(n) {
- if (n == 0)
- return true;
- else if (n == 1)
- return false;
- else if (n < 0)
- return isEven(-n);
- else
- return isEven(n-2);
- }
- console.log(isEven(50));
- // → true
- console.log(isEven(75));
- // → false
- console.log(isEven(-1));
- // → ?? runs out of stack space -> false
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