06. Operations Between Numbers

function OperationsBetweenNumbers(input) {
    let num1 = Number(input[0]);
    let num2 = Number(input[1]);
    let symbol = input[2];
    let number = "";
    let sum = 0;

    if (symbol === "+" || symbol === "-" || symbol === "*") {
        if (symbol === "+") {
            sum = num1 + num2;
        } else if (symbol === "-") {
            sum = num1 - num2;
        } else {
            sum = num1 * num2;
        }
        if (sum % 2 === 0) {
            number = "even";
        } else {
            number = "odd";
        }
        console.log(`${num1} ${symbol} ${num2} = ${sum} - ${number}`);
    } else {
        if (num2 === 0) {
            console.log(`Cannot divide ${num1} by zero`);
        } else {
            if (symbol === "/") {
                sum = num1 / num2;
                console.log(`${num1} / ${num2} = ${sum.toFixed(2)}`);
            } else if (symbol === "%") {
                sum = num1 % num2;
                console.log(`${num1} % ${num2} = ${sum}`);
            }
        }
    }
}

Решение с тернарен оператор:

function OperationsBetweenNumbers(input) {
    let num1 = Number(input[0]);
    let num2 = Number(input[1]);
    let symbol = input[2];

    let sum =
        symbol === "+" ? num1 + num2 :
        symbol === "-" ? num1 - num2 :
        symbol === "*" ? num1 * num2 :
        symbol === "/" && num2 !== 0 ? num1 / num2 :
        symbol === "%" && num2 !== 0 ? num1 % num2 : 0;

    let number = sum % 2 === 0 ? "even" : "odd";

    if (symbol === "+" || symbol === "-" || symbol === "*") {
        console.log(`${num1} ${symbol} ${num2} = ${sum} - ${number}`);
    } else if (symbol === "/" || symbol === "%") {
        console.log(num2 === 0 ? `Cannot divide ${num1} by zero` :
            `${num1} ${symbol} ${num2} = ${symbol === "/" ? sum.toFixed(2) : sum}`);
    }
}