Local and Global variables in Kotlin - scope, lifetime, purpose, declaration
Local variable and global variable:
Local Variables:
1. Scope: A local variable is declared within a specific block of code, such as a function, a loop, or a conditional statement. It is only accessible within that particular block where it is defined.
2. Lifetime: Local variables are created when their containing block is entered and are destroyed when the execution of that block finishes.
3. Purpose: They are typically used for temporary storage and data relevant only within a specific, limited context.
4. Declaration: They are typically declared using val (for immutable variables) or var (for mutable variables) directly inside the function or block.
Global Variables (Top-level Properties):
1. Scope: In Kotlin, true "global variables" in the sense of C/C++ are more accurately referred to as top-level properties. These are declared outside of any class or function, directly within a Kotlin file. They are accessible from anywhere within that same file.
2. Lifetime: Top-level properties exist for the entire duration of the program's execution.
3. Purpose: They are used for sharing data across different parts of an application.
4. Declaration: They are declared using val or var at the top level of a file.
Best Practice: It is generally recommended to use local variables whenever possible for better code modularity, reduced side effects, and easier debugging, limiting global variables to essential use cases.
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