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Discussion on: 5 ways to refactor if/else statements in JS functions

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Replies for: Hi there, great article, thank you! I like to deal with all the error cases first, and then dealing with the heart of the function. Also I like to...

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EECOLOR •

If you use async your code becomes a bit more natural:

async function divide(numerator, denominator) {
    if (typeof numerator !== "number") {
        throw new TypeError(`numerator should be a number in divide(${numerator}, ${denominator})`);
    }

    if (typeof denominator !== "number") {
        throw new TypeError(`denominator should be a number in divide(${numerator}, ${denominator})`);
    }

    if (0 === denominator) {
        throw new Error(`denominator should not be zero in divide(${numerator}, ${denominator})`);
    }

    return numerator / denominator;
});
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This however indicates that it would be probably be smart to remove the async and move that to a separate function. That would allow you to use the divide function in more scenario's.