What’s happening here and why?
document.write(0154); // === 108
What’s happening here and why? document.write(0154); // === 108
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Numbers that begin with 0 are considered octal (base-8) numbers.
base 8 [0154] = base 10 [108]
but if you had used a number that had an 8 or 9 you wouldn’t have seen this problem since that neither 8 nor 9 is an octal digit.