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```javascript
// Detect horizontal line block
function isHorizontalLineBlock(block) {
return block === "***";
}
// Render horizontal line block
function horizontalLineBlock(block) {
return `<hr>`;
}
// Compose an array of parsers
const parsers = [{
matcher: isHorizontalLineBlock,
renderers: [horizontalLineBlock]
}];
// And finally, our parser itself
function markdownToHTML(markdown) {
// Create blocks
const blocks = content.split(/\n\n/);
// Parse blocks
const parsedBlocks = blocks.map((block) => {
// Let's find a parser that has a matcher that matches
const parser = parsers.find((parser) => parser.matcher(block));
// If match was found, let's run our renderers over `block`
if (parser) {
for (const renderer of match.renderers) {
block = renderer(block);
}
}
return block;
});
// And at last, join the blocks together for one big block.
return parsedBlocks.join("");
}
```
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