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rand = function(min, max) {
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if (min==null && max==null)
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return 0;
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if (max == null) {
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max = min;
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min = 0;
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}
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return min + Math.floor(Math.random() * (max - min + 1));
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};
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console.log(rand(20,1));
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console.log(rand(1,10));
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console.log(rand(6));
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console.log(rand());
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