title: The const keyword in JavaScript:
body: <p>Today (in 2014) is it advisable to use the <em>const</em> keyword to declare constants in JavaScript? Are there still browser compatibility issues? Also, is there a way to declare a global constant?</p>
  
  <p>Note: This questions is not a duplicate, I am asking for the year 2014. Other posts in Stack Overflow date back to 2008-2012</p>