Datatypes are the type of values that can be represented and manipulated in a programming language.
These trivial data types defines only a single value.
These objects will be covered in detail in a separate chapter.
Variables can be defined as named containers for storing values which can be used later.For that You should place data into these containers and name the container.
multiple variables can also be declared with the same var keyword as follows -
Storing a value in a variable is called variable initialization.
You can initialize a variable at the time of creating it or later when you need that variable.
For example, lets consider that you have created a variable named as money, which can be assigned later
For another variable, you assigned a value at the time of initialization.
lets see the example as follows:
Note - In a document the var keyword is declared or initialized only once for the life of any variable name.
Same variable cannot be declared twice in a document.
The scope of a variable can be defined as the region or area of your program in which it is defined.
Function parameters will always be local to that function.
Suppose if you assign same name to both local and global variable,local variable with in a function takes precedence over global variable
If you declare a local variable or function parameter with the same name as a global variable,The global variable will be effectively hidden. Take a look into the following example.
The above produces the following result as "local".
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