具有三元運算符語法的JavaScript Prime Checker函數

Question

如何使用三元運算符語法重構以下內容？

let divisor = 2;
let isPrime = (num) => {
        if (num % divisor === 0) return false;
        else divisor++;
        return true;
};

console.log(`prime is ${isPrime(83)}`);

Answer 1

您可以使用條件運算符與逗號操作如下:在exp2

 let divisor = 2; let isPrime = num => num % divisor === 0 ? false : (++divisor, true); console.log(`prime is ${isPrime(83)}`); 

Answer 2

您可以增加數字並將其轉換為布爾值，因為非0的數字將轉換為true

(num) => num % divisor ? // > 0 == true : 0 == false
    !!(++divisor) // increment and convert to boolean
    : 
    false

 let divisor = 2; const isPrime = (num) => num % divisor ? !!(++divisor) : false; console.log(`prime is ${isPrime(83)}`);