Checking for Existing Options

module.exports = {
    data: new SlashCommandBuilder()
        // ... previous code for our SlashCommandBuilder.

    async execute(interaction) {
        // For simplicity, we'll declare our individual options.
        const authorName = interaction.options.getString('author-name')
        const authorIconURL = interaction.options.getString('author-icon-url')
        const authorUrl = interaction.options.getString('author-url')

        // We will now delcare our new EmbedBuilder, allowing us to add options later.
        const embed = new EmbedBuilder()

        // Now we need to add our authors. The easiest way to do this would be using
        // conditional (ternary) operators. Discord expects to receiver a string,
        // null, or undefined. With this knowledge, we can use an operator to pass
        // undefined if our option doesn't exist.

        // Let's not forget that we also need to make sure the author name exists.
        // Without our author name, we cannot use the other options since the name
        // is absolutely required if we're including an author in our embed.

        // With all of that in mind, let's implement it...
        if (authorName) {
            embed.setAuthor({
                name: authorName,
                iconURL: authorIconURL || undefined,
                url: authorUrl || undefined
            })
        }

        // You can do this for the rest of your options as well. If the string
        // option is required, you won't need to since it's guaranteed.
    }
}