Functions

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In its simplest form, it is a block of code that perform specific task(s).

Advantages of using Functions

1. Code reusability: You are able to reuse the fucntion throughout your system without duplicating your code.
2. Provides cleaner access to functionality.i.e I dont have to expose how I am performing a task other than calling the function.
3. Modularization: Function helps you brak down what would have been one big complex system, into smaller ‘group/blocks’ that performs specific tasks that all work together.
4. Another benefit of using functions is it easier to debug and test your functionalities.
5. A collegue, reiewer or any concrned stake holder is able to read and understand your code if it is broken down to smaller functions .

Terms to know

Parameter: variable name that specifies the iput that a function expected

Arguments: Values passed to a function when it is called.

Types of parameters

1. Positional : These are type of paremeters that must be passed in the same order as they appear in the function.
2. Keyword parameters: parameters thatare specified by keywords rather than positions.
3. Default parameters:These parameters have default values that are provided during functional defination.If other values are not provided the defualt values will be used.
4. Variable-length : Type of parameters defination that allows a funtion to take a different number of parameters as need be. it is represented as `*args` for positional parameter and **kwargs for keyword parameter.

Lamda function
Anonymous function that is used to improve code reradability and reduce verbosity.They take any number parameters

Syntax of a function in python

 def function_name():
    pass #when you are not ready define th function yet.


def function_name(parameters):
    some logic
    return and/or print statements.

#lambda function
sum = x:x+x
print(sum(1,2,3))

Functions are a building block in functional programming paradigm.They are first-class citizen and composable(can be combined with other functions to create a new function) and pure(always has the same output for the same input).