Statements and Expressions in Javascript.
Working with Expressions & Statements in Javascript?
 A statement controls the sequence of execution.
 The Statement uses expression to evaluate a resulting outcome.
 The Statement must end with a semicolon.
 Whitespace such as tabs, spaces, and new lines is generally ignored in statements.
 Blocks with statements begins with an opening brace ({) and ends with a closing brace (}) and is not ended with a semicolon.
 In Javascript will anything that evaluates to a numeric value be an expression. Thus, the statement 4+9; returns the value 13, so it is an expression.

You can consider all expressions as statements in Javascript.
For example:
<script type="text/javascript"> var a=4; var b="45", c=0, d=true; document.write("a: "+ a +" b: "+b); document.write(" c: "+ c +" d: "+d+"<br>"); a = 3; b = 9; d = c = a+b; document.write("a: "+ a +" b: "+b); document.write(" c: "+ c +" d: "+d+"<br>"); </script>
The result should be:a: 4 b: 45 c: 0 d: true
a: 3 b: 9 c: 12 d: 12  Go to the next session for more details about the handling of numbers and the create numeric expressions.
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