๐ Topic Summary
JavaScript variables are like labeled containers that hold information (data) in your code. Think of them as boxes where you can store numbers, words, or even more complex things. Keeping your variables safe means protecting that information from being accidentally changed or accessed by someone who shouldn't. This involves using good coding practices to avoid errors and security vulnerabilities. Proper variable management is crucial for creating reliable and secure JavaScript programs.
For example, if you're building a game, you might use a variable called playerScore to keep track of the player's score. Making sure this variable is handled safely prevents cheating and ensures fair gameplay!
๐งฎ Part A: Vocabulary
| Term |
Definition (Mixed Up) |
| Variable |
๐ A potential weakness in a computer system that can be exploited. |
| Data Type |
๐ฆ A named storage location that holds a value. |
| Scope |
๐ The visibility and accessibility of a variable in a program. |
| Constant |
๐ Specifies the type of data a variable can hold (e.g., number, string). |
| Vulnerability |
๐ก๏ธ A value that cannot be changed after it is assigned. |
โ๏ธ Part B: Fill in the Blanks
When declaring a variable in JavaScript, you use the keyword __________, __________ , or __________. It's important to choose descriptive __________ names. To protect your data, you can use __________ variables, which cannot be changed after they are assigned. Always be mindful of variable __________, which determines where in your code the variable can be accessed.
๐ค Part C: Critical Thinking
Why is it important to use meaningful variable names when writing JavaScript code? Give an example of a scenario where using a poorly named variable could lead to errors or confusion.