anchor.diff:  
         section
           h1 Let
  -        h3.bullet How does var's scoping work?
  +        h3.bullet How does #[span.token.keyword var]'s scoping work?
           ul
  -          li var is function scoped
  +          li #[span.token.keyword var] is function scoped
   
         section
           h1 Var
  
positive.code:             }
  
        section
          h1.bullet Let
          ul
            li #[span.token.keyword var] is function scoped
            li #[span.token.keyword let] is block scoped
            li A block is any pair of { }
  
negative.code:               console.log(a); // 2
              }
  
        section
          h1 Let - Why?
          ul.bullet
            li Principle of Least Privilege
            li If a variable is not used outside of a block of code, don't expose it
  
        section
          h1 Let - Gotchas
          ul.bullet
            li Let is not hoisted like var
            li Because of the way Babel transpiles let, let is hoisted when using Babel
  
        section
          h1 Let - Babel
  
  
  
  
      script(src='build/build.js')
  