json parse vs eval (v3)

Revision 3 of this benchmark created on

Setup

const obj = generateRandomObject(5, 5);
let path = findRandomPrimitivePath(obj);


const str_obj=JSON.stringify(obj)


const f1text=`const obj=${str_obj};const ttt=obj.$path`

const f2text=`const obj=JSON.parse('${str_obj}');const ttt=obj.$path`


// -------------------


function generateRandomObject(maxWidth, maxDepth) {
  const chars = 'abcdefghijklmnopqrstuvwxyz';

  function randomKey() {
    return chars[Math.floor(Math.random() * chars.length)] + Math.floor(Math.random() * 100);
  }

  function randomValue(depth) {
    if (depth >= maxDepth || Math.random() < 0.3) {
      return Math.random() < 0.5
        ? Math.floor(Math.random() * 1000)
        : Math.random().toString(36).substring(2, 7);
    } else {
      return generateLevel(depth + 1);
    }
  }

  function generateLevel(depth) {
    const obj = {};
    const width = Math.floor(Math.random() * maxWidth) + 1;
    for (let i = 0; i < width; i++) {
      obj[randomKey()] = randomValue(depth);
    }
    return obj;
  }

  return generateLevel(0);
}

function findRandomPrimitivePath(obj) {
  const paths = [];

  function traverse(current, path) {
    if (typeof current !== 'object' || current === null) {
      paths.push(path);
    } else {
      for (const key in current) {
        traverse(current[key], path.concat(key));
      }
    }
  }

  traverse(obj, []);
  if (paths.length === 0) return null;

  const chosenPath = paths[Math.floor(Math.random() * paths.length)];
  return chosenPath.join('.');
}


5

Teardown

path = findRandomPrimitivePath(obj);

Test runner

Ready to run.

Testing in
TestOps/sec
eval
eval(f1text)
ready
parse
eval(f2text)
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.