Notes from chapter 2.

• Declaring variables
  • var declares a variable in the global scope.
  • let declares a variable in the locap scope.
  • const declares a constant.
  • Automatic coersion occurs and strange results occur
  • But you can cast things.
  • a++ and ++a both work.
  • --, += and such work as well.

  • <script type="text/javascript">
    let a = "5";
    let b = 2;
    console.log('a = ', a , 'a is a' , typeof(a));
    console.log('b = ', b , 'b is a' , typeof(b));
    console.log('a + b  = ', a+b);
    console.log('a - b  = ', a-b);
    console.log('Number(a) - b  = ', Number(a)-b);
    console.log("a++ = ", a++);
    console.log("a++ = ", a++);
    console.log("b = ", b);
    console.log("b++ = ", b++);
    console.log("b++ = ", b++);
    console.log("++b = ", ++b);
    console.log("b = ", b);
    </script> 

• Control structures are mostly as you expect
  • if, if - else , no elseif statement
  • for, while, do-while
  • switch is not restricted to enumerable types.
  • comments are // and /* */ like c++.