Tiny QR code generator for showing text/urls in the terminal

qr.js

#!/usr/bin/env node
const QR = require("qr-image");

const arrayOf = (len, filler) => new Array(len).fill(filler);

const text = process.argv[2];

const matrix = QR.matrix(text, "L");
const topBottomPad = arrayOf(4, arrayOf(matrix[0].length, 0));
const rowPad = arrayOf(4, 0);
const qr = topBottomPad
  .concat(matrix, topBottomPad)
  .map(row =>
    rowPad
      .concat(row, rowPad)
      .map(i => (i ? "  " : "██"))
      .join("")
  )
  .join("\n");

console.log(qr);
console.log(text);