Programming ConceptsLesson 10Free preview

Scope

This lesson is part of Intro to Programming · All levels

Summary

This lesson discusses scope, the rules of the region of action of a variable in a program. The local variable can only be accessed within the function or block where it is created, whereas the global variable is alive throughout the program. Understanding the scope prevents name collisions and makes bugs related to variables much easier to avoid.

Key points

Scope determines where a variable can be accessed
Local variables are only visible within the constructor function/block
Global variables can be accessed from anywhere in the program
Narrow scope reduces name and bug conflicts

Full lesson

Code examples and quizzes

Full lessons, code examples, and quizzes are available to subscribers. 5 questions.