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Feb 19th, 2017
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  1. // A simple counter example
  2. // The setup will be more complicated in modern apps built using React
  3.  
  4. const incrementNode = document.getElementById('increment');
  5. const decrementNode = document.getElementById('decrement');
  6. const inputNode = document.getElementById('counter');
  7.  
  8. const counter = {
  9. initialize() {
  10. incrementNode.addEventListener('click', (event) => {
  11. event.preventDefault();
  12. const currentValue = inputNode.value;
  13. inputNode.value = parseInt(currentValue, 0) + 1;
  14. });
  15.  
  16. decrementNode.addEventListener('click', (event) => {
  17. event.preventDefault();
  18. const currentValue = inputNode.value;
  19. if (currentValue > 0) {
  20. inputNode.value = parseInt(currentValue, 0) - 1;
  21. }
  22. });
  23. }
  24. };
  25.  
  26. export default counter;
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