JS block scope

js-block-scope.js

const outerFunc = () => {
  // function scope
  const message = 'Hi, Hela !';

  {
    // block scope
    const message = 'Hello !';
    console.log('inside message : ', message); // "inside message : ", "Hello !"
  }

  for (const color of ['green', 'red', 'blue']) {
    // "for" block scope
    const message = 'Hi';
    console.log(color); // 'green', 'red', 'blue'
    console.log(message); // 'Hi', 'Hi', 'Hi'
  }
  
  // console.log('color : ', color); // throws ReferenceError
  
  console.log('outside message : ', message); // "outside message : ", "Hi, Hela !"
}

outerFunc();