[Solved] JavaScript sometimes behave differently

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Because it’s got a bug. See this line in del():

num=num.replace(num[num.length-1],'');

What does it do? It takes the last character of num, and replaces, that’s the bug, the first occurrence of that character.

Fixed version:

num = num.substr(0, num.length - 1);

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solved JavaScript sometimes behave differently