In this JavaScript lesson from Codecademy’s JS course we take a look at What is Scope in Programming, Intro to Scope in JavaScript, Programming with Codecademy ES6 JS Guide. This lesson is an introduction to JavaScript scope and explains by analogy of the night sky. The night sky is accessible globally to everyone, though a city might have local access to a river or other local part, but the sky is accessible globally. We are told that scope deals with where our variables can be accessed from, and where they may not be accessed. If this is still not making sense, we will be going over more regarding scope in the next lessons.
Scope in programming is a crucial concept that every programmer should understand, and in this JavaScript lesson from Codecademy’s ES6 JS Guide, we will be introducing you to the world of scope in programming.
The concept of scope can be explained using an analogy of the night sky. Just as the night sky is accessible globally to everyone, there are certain areas in the sky that are only accessible to specific regions, such as a constellation that can only be seen from a certain hemisphere. Similarly, in programming, scope deals with where our variables can be accessed from and where they may not be accessed.
In JavaScript, there are two types of scope: global scope and local scope. Global scope is accessible from anywhere in the program, while local scope is only accessible within a specific block of code. Variables declared inside a function have local scope, which means that they cannot be accessed outside of the function.
It is important to note that local scope can also have its own sub-scope, which is created by nested functions. Variables declared inside a nested function can only be accessed within that function and its child functions.
Understanding the concept of scope is vital for programming, as it affects how we write our code and how we debug it. If we have a variable that is declared in the wrong scope, it can lead to unexpected behavior or errors in our program.
Codecademy’s ES6 JS Guide provides an introduction to scope in programming and explains the basics of global and local scope. In addition, they provide examples and exercises to help you practice working with scope in JavaScript.
In conclusion, scope is a crucial concept in programming, and understanding it is vital for writing efficient and bug-free code. Codecademy’s ES6 JS Guide provides a great introduction to scope in JavaScript, and we highly recommend studying this topic thoroughly before moving on to more advanced concepts.