Solution for 1st part metabase

mdfromat.js

/**

  problem spec:
  https://gist.github.com/ranquild/7d3b92d74322d430ea37d97a13868676

*/

import { sampleInput, sampleOutput } from "./samples";

const formatMD = (input) => {
  const { content } = input;
  return content.reduce((formattedMD, contentPart) => {
    if (contentPart.tag === "heading") {
      return `${formattedMD}# ${contentPart.content[0]}\n\n`;
    }
    if (contentPart.tag === "paragraph") {
      const text = contentPart.content;

      const formattedText = text.reduce((current, textPart) => {
        if (typeof textPart === "string") {
          return current + textPart;
        }

        if (typeof textPart === "object") {
          if (textPart.tag === "bold") {
            return `${current}**${textPart.content[0]}**`;
          }
          if (textPart.tag === "italic") {
            return `${current}*${textPart.content[0]}*`;
          }
        }
        return current;
      }, "");
      return formattedMD + formattedText + "\n\n";
    }

    return formattedMD;
  }, "");
};

// Hi, I spent a few minutes after the meeting to fix the console ;)

console.log(formatMD(sampleInput));
console.log(sampleOutput === formatMD(sampleInput));