#MonthOfCode - Day 4: error

My entry for the 4th day of the month of code. The theme for today is: error.

This code has errors. Fix them until it’s green!

Code after the break.

error.jsview raw
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document.addEventListener('DOMContentLoaded', function() {

  $('#moc-4 > textarea').on('keyup', function () {
    var source = this.value;
    function assert(ok) {
      if(ok !== true) {
        throw new Error('Assertion failed');
      }
    }
    var hasErrors = false;
    try {
      eval(source);
    } catch (e) {
      hasErrors = true;
    }
    $(this).css('background-color', hasErrors ? '#F08C8C' : '#8CF08C');
  });

});