moveLeft() {
    this.moveDirection = 'left';
    this.wrapper.classList.remove('moveright');
    this.wrapper.classList.add('moveleft');
  }
// add a css-class called 'moveleft' on the wrapper element, concequently trigger a css animation which move the wrapper element  on x-axis by -640px.
add a css-class called 'moveleft' on the wrapper element, concequently trigger a css animation which move the wrapper element  on x-axis by -640px.
add a css - class called ' moveleft ' on the wrapper element concequently trigger a css animation which move the wrapper element on x - axis by - 640px .
moveLeft() {
    this.moveDirection = 'left';
    this.wrapper.classList.remove('moveright');
    this.wrapper.classList.add('moveleft');
  }
moveLeft ( ) { this . moveDirection = 'left' ; this . wrapper . classList . remove ( 'moveright' ) ; this . wrapper . classList . add ( 'moveleft' ) ; }
add a css-class called 'moveleft' on the wrapper element, concequently trigger a css animation which move the wrapper element  on x-axis by -640px.
add a css - class called ' moveleft ' on the wrapper element concequently trigger a css animation which move the wrapper element on x - axis by - 640px .