4. Functions
Functions are essential building blocks in programming that encapsulate code to perform specific tasks, promoting modularity and reusability. Various types of functions include library and user-defined functions, each serving different purposes. The knowledge of function parameters, overloading, and their types enhances a programmer's ability to write clear and efficient code.
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What we have learnt
- A function is a block of code designed to perform a specific task.
- Functions enhance modularity and reduce code duplication.
- There are different types of functions, including library functions and user-defined functions.
Key Concepts
- -- Function
- A block of code that performs a specific task and can be called multiple times.
- -- Library Functions
- Predefined functions provided by programming languages, such as Math.sqrt() in Java.
- -- Userdefined Functions
- Functions created by programmers to perform specific operations based on custom needs.
- -- Parameters
- Variables defined in the function declaration (formal parameters) and the data passed to a function when it is called (actual parameters).
- -- Pure Function
- A function that does not alter any external state and always produces the same output for the same input.
- -- Impure Function
- A function that can change external states or produce side effects, like modifying global variables.
- -- Function Overloading
- A feature allowing multiple functions to have the same name but different parameter lists.
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