JavaScript Keywords and Variables Definition - Explained For Newbies
Beginner's Guide to Programming
Welcome to this beginner's guide.
In this post, I'll be explaining:
Meaning of "keyword" in Programming
Meaning of variables
What declaring a variable means
Naming a variable
Difference between declaring and naming a variable
Let's go. 🚀
Keywords
In programming terms, keywords are reserved words.
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"Reserved words" implies that you can't use those words wherever you want. They are reserved for special use and you can't use them for variables names or function names.
Click here for more information and examples about keywords in other programming languages.
Meaning of variables
In programming, variables are simply container for storing data. We use variables to hold values.
For example, var paint = red
Above here, "paint" is the variable storing a data "red". You are assigning red to paint.
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Declaring a variable
When you declare variables, you are telling the program that you want to set a variable to use in the future.
For example, var paint = red
In this example, paint as a variable is declared with the "var" keyword. "var" in JavaScript is a keyword for declaring a variable and it is case sensitive, this, "Var" is not seen as "var".
Naming a variable
This is easy, every declared variable can be intialised by giving it a name.
To make it easier, see a variable as a bucket, the bucket stores red paint and the label of the bucket is the variable name.
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So in the example var paint = red "paint" is the variable name.
Difference between declaring and naming a variable
To explain this, declaring a variable is like buying a bucket, naming a variable is like putting a label on the bucket.
As explained earlier, declaring variable is to tell the program that you want to set a variable to use in the future and this creates the variable space in the program memory.
Hopefully you'll find this blog helpful as you learn to code more effectively, and to know there's a lot more to learning to code than just the begining.
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