Other than shortening it a bit, I'd change the second parameter:
const lineChecker = (ilne, followup) => line ? followup ? `<p>${line}</p>` : `<h1>${line}</h1>` : `<br>`
Why switch the boolean around? Because now you can do
let liens = ["Title", "", "paragraph"].map(lineChecker)
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Other than shortening it a bit, I'd change the second parameter:
Why switch the boolean around? Because now you can do