trafficLightsSwitch.js

/*
You're writing code to control your town's traffic lights. You need a function to handle each change from green, to yellow, to red, and then to green again.

Complete the function that takes a string as an argument representing the current state of the light and returns a string representing the state the light should change to.

For example, update_light('green') should return 'yellow'.
*/

//Answer//

const updateLight = current => ({
  green: 'yellow',
  yellow: 'red',
  red: 'green',
})[current]

//OR//

function updateLight(current) {
  
  return current === 'yellow' ? 'red' : current === 'green' ? 'yellow' : 'green';

}

//OR//


function updateLight(c) {
switch (c){
case 'green': return 'yellow'; break;
case 'yellow': return 'red'; break;
case 'red': return 'green';
}
}