expression-explorer is a JQuery plugin for drilling down into an expression evaluation tree.

Take the following expression consisting of digits, basic mathematical operators and functions:

   (2+3) × (4+5) + Max(20+2, 31, 16, 62, 40)

This would evaluate as follows:

   (((2+3)×(4+5))+Max(22, 31, 16, 62, 40))  
 ⇒ ((5×9)+62)  
 ⇒ (45+62)  
 ⇒ 107

The expression-explorer control will begin by showing the answer then allow the user to drill-down to discover how a particular value was produced.

For example, the user will initially be presented with the final value presented as a button:

User clicks the [107] button which changes the control to this:

[62] button is clicked which changes the control to this:

.png)

User now clicks [22]

, 31, 16, 62, 40).png)