JSON stringify/parse performance test

test_perf.js

// http://instacode.dev/#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

const perfTest = (name, callback) => {
	const d0 = +new Date();
  callback();
  const d1 = +new Date();
  console.log(`Test ${name}: ${d1-d0}ms`);
};


const REPS = 10;
const SIZE = 1e5;

const arr = [];
for (let i = 0; i < SIZE; ++i) {
  arr[i] = {i, rnd: Math.random()};
}
const str = JSON.stringify(arr);

perfTest('stringify', () => {
  for (let i = 0; i < REPS; ++i) {
  	JSON.stringify(arr);
  }
});

perfTest('parse', () => {
  for (let i = 0; i < REPS; ++i) {
  	JSON.parse(str);
  }
});