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Conditional property in object #21
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const busNum = 75
const btsName = undefined
const data = {
...(busNum && { bus: busNum }),
...(btsName && { bts: btsName })
}
console.log(data)
// { bus: 75 }Falsy values (null, undefined, false, NaN, 0, -0, 0n, "") สามารถ spread ได้ ได้ผลลัพธ์เหมือน ...{}
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