how to make a pong game in javascript code example

Example: vertical line for pong javascript

// define initial player score
var playerLeft = playerRight = 0

// create text for the score, set font properties
var scoreLeft = draw.text(playerLeft+'').font({
  size: 32,
  family: 'Menlo, sans-serif',
  anchor: 'end',
  fill: '#fff'
}).move(width/2-10, 10)

// cloning rocks!
var scoreRight = scoreLeft.clone()
  .text(playerRight+'')
  .font('anchor', 'start')
  .x(width/2+10)