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Functional programming language list code#

Let's create a pure function to multiply numbers by 2: def multiply_2_pure( numbers):Ĭhanged_numbers = multiply_2_pure(original_numbers) As it does not change the state of any variable, we are guaranteed to get the same output every time we run the function with the same input. This makes the function we write much easier to test. If you'd like functions to be pure, then do not change the value of the input or any data that exists outside the function's scope. Without any special Python features or libraries, we can start coding in a more functional way. Haskell has also influenced iterators and generators in Python through its lazy loading, but that feature isn't necessary for a functional language.

This allows us to abstract over actions, giving us flexibility in our code's behavior.

Higher Order Functions - functions can accept other functions as parameters and functions can return new functions as output.

You would have to set my_list to a new List if you'd like to use different values. If my_list is immutable, you wouldn't be able to change the individual items. Take for example creating a List with 3 items and storing it in a variable my_list.

Immutability - data cannot be changed after it is created.

Given the same input, a pure function will always produce the same output.

Pure Functions - do not have side effects, that is, they do not change the state of the program.

To get a better appreciation of what a functional language is, let's look at features in Haskell that can be seen as desirable, functional traits: Some of Python's features were influenced by Haskell, a purely functional programming language. Python is usually coded in an imperative way but can use the declarative style if necessary. This is usually contrasted with imperative languages that tell the computer what steps to take to solve a problem. Functional Programming Conceptsįunctional languages are declarative languages, they tell the computer what result they want.

With Python, it's easy to write code in a functional style, which may provide the best solution for the task at hand. Python is not a functional programming language but it does incorporate some of its concepts alongside other programming paradigms. While there is no strict definition of what constitutes a functional language, we consider them to be languages that use functions to transform data. Functional Programming is a popular programming paradigm closely linked to computer science's mathematical foundations.

Functional programming language list code#