Puzzle: Event Block

README.md

Puzzle: Event Block

My JavaScript solution to the Code100 puzzle Event Block.

This will run in Node.js. Make sure the file is in the same directory as the JSON file. Then run

node event-block.mjs

event-block.mjs

import { readFileSync } from "fs";
import { fileURLToPath } from "url";
import { join, dirname } from "path";

function getData() {
  const __dirname = dirname(fileURLToPath(import.meta.url));
  const data = readFileSync(join(__dirname, "data.json"), "utf8");
  return JSON.parse(data);
}

function blankLine(columns, padChar) {
  return padChar.repeat(columns);
}

function eventLine(columns, padChar, event) {
  let line = "";
  const { name, date, location } = event;
  line += `${padChar} ${name} `;
  const endLine = ` ${date} ${padChar}`;
  if (location) {
    // Find the centre of the location string (add 2 to account for spaces).
    const halfLocationLength = Math.floor((location.length + 2) / 2);
    // Find the centre of the line
    const halfWidth = Math.floor(columns / 2);
    // Find the start of the location string within the columns.
    const locationStart = halfWidth - halfLocationLength;
    // Add enough padChars to get to one before the location string.
    line += padChar.repeat(locationStart - line.length  - 1);
    line += ` ${location} `;
  }
  // The remaining padding is the difference between the columns and the current
  // line length plus the last part of the line.
  line += padChar.repeat(columns - line.length - endLine.length);
  line += endLine;
  return line;
}

function run() {
  const data = getData();
  const { columns, padChar, events } = data;
  const result = [];
  result.push(blankLine(columns, padChar));
  events.forEach((event) => result.push(eventLine(columns, padChar, event)));
  result.push(blankLine(columns, padChar));
  return result;
}

const result = run();
console.log(result.join("\n"));

That explanation was mostly for me 😅