Clearing Javascript basics regarding variables
by vsasikalabe Updated: Mar 2, 2023
Guide Kit
Variable initialization is storing a value in a variable. At the time of variable creation, we can do variable initialization; otherwise, later, when you need that variable. A local variable comes before a global variable with the same name within the body of a function. We can effectively hide the global variable if you declare a local variable or function parameter with the same name as a global variable. JavaScript is used for variable Scope.
JavaScript variables have only two scopes.
- Global Variables − These can be defined anywhere in your JavaScript code.
- Local Variables − A local variable will be used only within a function where it is defined. Function parameters are always local to that same function.
Use the undefined to unset a variable in JavaScript. Not assigned any value to a Variable is of type undefined. If the variable being evaluated does not have an assigned value, a method or statement also returns undefined. If a value is not returned to a function, it returns undefined. A variable is declared but not assigned any value known as undefined.
Keep the following rules in mind while naming your variables in JavaScript:
- JavaScript-reserved keywords are not allowed as variable names.
- JavaScript variable names do not allow a number as a first letter. They always begin with a letter or an underscore character.
- JavaScript variable names are case-sensitive.
Here is an example of how to use Javascript basic Variables:
Preview of the output that you will get on running this code from your IDE.
Code
Instructions
Follow the steps carefully to get the output easily.
- Download and Install VS Code on your Desktop.
- Open the VS Code and install Javascript ES6 Code Snippet and Code Runner from Extensions.
- Open the new file and save as filename.js
- Copy the code using the "Copy" button above, and paste it in your javascript file.
- Run the code using (ctr+alt+N) Run button.
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Environment Tested
I tested this solution in the following versions. Be mindful of changes when working with other versions.
- The solution is created in VS Code 1.73.1 version.
- JavaScript (ES6) code snippets v1.8.0
- Code Runner v0.11.8
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