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Javascript Variables

1. Variables

Variables are simply named placeholders for data. You use them to store information about something. In programming, they're often used to hold values.

2. Constants

Constants are variables that have a value assigned to them at compile time. They cannot change their value.

3. Local variables

Local variables are variables declared inside a function. They only exist while the function runs.

4. Global variables

Global variables are variables declared outside any function. They exist throughout the entire program.

5. Static variables

Static variables are variables that don't change over time. They are not affected by changes to the program's state.

6. Dynamic variables

Dynamic variables are variables that change depending on what happens in the program.

7. Input/Output

Input/output (I/O) is the interaction between a computer program and its environment. I/O is the exchange of information between a program and its surroundings.