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function div_mod(a, b)
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{
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if (b <= 0)
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throw new Error("b cannot be zero. Undefined.");
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if (isInt(a) && !isInt(b))
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throw new Error("A or B are not integers.");
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return [Math.floor(a / b), a % b];
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}
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function isInt(n) {
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return n % 1 === 0;
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}
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console.log(div_mod(17, 4));
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