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function factorial(number) {
    var result = 1;
    for (var i = 1; i <= number; i++) {
        result *= i;
    }
    console.log(result);
}
factorial(5); // 120

// Also explained on https://medium.freecodecamp.com/how-to-factorialize-a-number-in-javascript-9263c89a4b38