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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));

// → false