9 lines
297 B
JavaScript
9 lines
297 B
JavaScript
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function addTogether() {
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const arr = Array.from(arguments);
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return arr.some(n => typeof n !== "number")
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? undefined
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: arr.length > 1
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? arr.reduce((a, b) => a + b)
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: n => (typeof n === "number" ? n + arr[0] : undefined);
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}
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console.log(addTogether(5)(7));
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