#11 Preparing for React: What is Scope in JavaScript and how to avoid losing variables.
Are you writing a variable inside a function, and the browser is screaming "is not defined"? It's time to get to grips with scope. In this lesson, we'll explain JavaScript scope in a nutshell: how global scope differs from local scope, how curly braces isolate code, and a VS Code lifehack that will help you hide unnecessary lines.
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💡 Cheat Sheet:
Scope determines the accessibility of variables in different parts of your code.
1. Global Scope — variables declared outside of functions/blocks. Visible everywhere in your file.
2. Local Scope — variables declared within a function or curly braces {} (using let or const). Accessible ONLY within these braces. Attempting to access them outside will result in a ReferenceError.
#javascript #react #frontend #scope #devhotspot