클래스, 함수 변경해보기

Study/JavaScript

클래스, 함수 변경해보기

더 멋진 세상을 꿈꾸는 개발자 2020. 6. 7. 22:46

함수 스타일로 작성된 Clock 클래스를 ‘클래스’ 문법으로 다시 써봅시다.

<!doctype html>
<script>

  function Clock({ template }) {
  
    let timer;
  
    function render() {
      let date = new Date();
  
      let hours = date.getHours();
      if (hours < 10) hours = '0' + hours;
  
      let mins = date.getMinutes();
      if (mins < 10) mins = '0' + mins;
  
      let secs = date.getSeconds();
      if (secs < 10) secs = '0' + secs;
  
      let output = template
        .replace('h', hours)
        .replace('m', mins)
        .replace('s', secs);
  
      console.log(output);
    }
  
    this.stop = function() {
      clearInterval(timer);
    };
  
    this.start = function() {
      render();
      timer = setInterval(render, 1000);
    };
  
  }
  
  let clock = new Clock({template: 'h:m:s'});
  clock.start();

</script>

</html>

class Clock {
  constructor({ template }) {
    this.template = template;
  }

  render() {
    let date = new Date();

    let hours = date.getHours();
    if (hours < 10) hours = '0' + hours;

    let mins = date.getMinutes();
    if (mins < 10) mins = '0' + mins;

    let secs = date.getSeconds();
    if (secs < 10) secs = '0' + secs;

    let output = this.template
      .replace('h', hours)
      .replace('m', mins)
      .replace('s', secs);

    console.log(output);
  }

  stop() {
    clearInterval(this.timer);
  }

  start() {
    this.render();
    this.timer = setInterval(() => this.render(), 1000);
  }
}


let clock = new Clock({template: 'h:m:s'});
clock.start();

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