Overview

Students learn about global versus local variables, and use variables to track the score in a simple game.

Vocab

• == - The equality operator (sometimes read: "equal equal") is used to compare two values, and returns a Boolean (true/false). Avoid confusion with the assignment operator "=",
• Global Variable - A variable whose scope is "global" to the program, it can be used and updated by any part of the code. Its global scope is typically derived from the variable being declared (created) outside of any function, object, or method.
• If-Statement - The common programming structure that implements "conditional statements".
• Local Variable - A variable with local scope is one that can only be seen, used and updated by code within the same scope. Typically this means the variable was declared (created) inside a function -- includes function parameter variables.
• Variable Scope - dictates what portions of the code can "see" or use a variable, typically derived from where the variable was first created. (See Global v. Local)

New Code

• setText(id, text)
• if( ){ //code }
• __ == __

Resources

• Activity Guide - The Clicker Game - Activity Guide (copy as MS Word, Google Doc)