declaration.js

// constで変数を定義する
const constLoop = function () {

  const logName = current.name + ':' + current.ret;

  console.time(logName);

  for (let i = 0; i < MAX_COUNT; i++) {
    const a = 'a';
    const b = 'b';
    const c = 'c';
    const d = 'd';

    `${a}_${b}_${c}_${d}`;
  }

  console.timeEnd(logName);

  current.ret++;
};
// varで変数を定義する
const varLoop = function () {

  const logName = current.name + ':' + current.ret;

  console.time(logName);

  for (let i = 0; i < MAX_COUNT; i++) {
    var a = 'a';
    var b = 'b';
    var c = 'c';
    var d = 'd';
    `${a}_${b}_${c}_${d}`;
  }
  console.timeEnd(current.name + ':' + current.ret);
  current.ret++;
};

// letで変数を定義する
const letLoop = function () {

  const logName = current.name + ':' + current.ret;

  console.time(logName);

  for (let i = 0; i < MAX_COUNT; i++) {
    let a = 'a';
    let b = 'b';
    let c = 'c';
    let d = 'd';
    `${a}_${b}_${c}_${d}`;
  }

  console.timeEnd(logName);
  current.ret++;
};