Skip to main content
ubuntuask.com

Back to all posts

How to Get the Length Of A List In Haskell?

Published on
3 min read
How to Get the Length Of A List In Haskell? image

Best Haskell Programming Books to Buy in November 2025

1 Learn Physics with Functional Programming: A Hands-on Guide to Exploring Physics with Haskell

Learn Physics with Functional Programming: A Hands-on Guide to Exploring Physics with Haskell

BUY & SAVE
$39.11 $49.99
Save 22%
Learn Physics with Functional Programming: A Hands-on Guide to Exploring Physics with Haskell
2 Programming in Haskell

Programming in Haskell

BUY & SAVE
$37.69 $47.00
Save 20%
Programming in Haskell
3 Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming

Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming

BUY & SAVE
$55.05 $57.95
Save 5%
Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming
4 Real World Haskell

Real World Haskell

  • QUALITY ASSURANCE: THOROUGHLY INSPECTED FOR GOOD CONDITION AND USABILITY.
  • AFFORDABLE PRICES: SAVE MONEY WHILE GETTING QUALITY READING MATERIAL.
  • ECO-FRIENDLY CHOICE: PROMOTE SUSTAINABILITY BY REUSING BOOKS.
BUY & SAVE
$24.40 $49.99
Save 51%
Real World Haskell
5 Learn You a Haskell for Great Good!: A Beginner's Guide

Learn You a Haskell for Great Good!: A Beginner's Guide

  • HIGH-QUALITY USED BOOKS AT AFFORDABLE PRICES.
  • THOROUGHLY INSPECTED FOR GOOD CONDITION AND VALUE.
  • ECO-FRIENDLY CHOICE: REDUCE WASTE BY BUYING USED!
BUY & SAVE
$30.82 $44.95
Save 31%
Learn You a Haskell for Great Good!: A Beginner's Guide
6 Soar with Haskell: The ultimate beginners' guide to mastering functional programming from the ground up

Soar with Haskell: The ultimate beginners' guide to mastering functional programming from the ground up

BUY & SAVE
$45.99
Soar with Haskell: The ultimate beginners' guide to mastering functional programming from the ground up
7 Introduction to Computation: Haskell, Logic and Automata (Undergraduate Topics in Computer Science)

Introduction to Computation: Haskell, Logic and Automata (Undergraduate Topics in Computer Science)

BUY & SAVE
$25.40 $37.99
Save 33%
Introduction to Computation: Haskell, Logic and Automata (Undergraduate Topics in Computer Science)
8 Parallel and Concurrent Programming in Haskell: Techniques for Multicore and Multithreaded Programming

Parallel and Concurrent Programming in Haskell: Techniques for Multicore and Multithreaded Programming

BUY & SAVE
$25.83 $44.99
Save 43%
Parallel and Concurrent Programming in Haskell: Techniques for Multicore and Multithreaded Programming
9 Get Programming with Haskell

Get Programming with Haskell

BUY & SAVE
$44.99
Get Programming with Haskell
10 Thinking Functionally with Haskell

Thinking Functionally with Haskell

BUY & SAVE
$40.24 $64.00
Save 37%
Thinking Functionally with Haskell
+
ONE MORE?

To get the length of a list in Haskell, you can use the length function which is provided in the standard Prelude module. The length function takes a list as its argument and returns an integer representing the number of elements in that list.

Here is an example of how to use the length function:

myList = [1, 2, 3, 4, 5] lengthOfMyList = length myList

In this example, myList is a list containing five elements. The length function is then used to compute the length of myList, and the result is stored in the lengthOfMyList variable. In this case, lengthOfMyList will hold the value 5.

It's important to note that the length function calculates the length of a list by iterating through all its elements, so it has a time complexity of O(n) where n is the number of elements in the list.

Can the length function be used on a list with negative elements in Haskell?

Yes, the length function in Haskell can be used on a list with negative elements. The length function simply returns the number of elements in a list, regardless of their values. It does not differentiate between positive and negative elements.

Can the length function be used on a list with repeating elements in Haskell?

Yes, the length function can be used on a list with repeating elements in Haskell. The length function simply returns the number of elements in the list, regardless of whether they are unique or repeated.

What is a list in Haskell?

In Haskell, a list is a built-in data structure that stores a sequence of elements of the same type. It is an ordered collection and can be used to store and manipulate large amounts of data efficiently.

Lists in Haskell are defined using square brackets [], and elements are separated by commas. For example, [1, 2, 3] is a list of integers containing three elements: 1, 2, and 3.

Lists in Haskell are homogeneous, meaning that all elements in a list must be of the same type. Haskell requires this type homogeneity to allow for efficient implementation and reliable type inference.

Lists in Haskell are also immutable, meaning that once a list is created, its elements cannot be modified. However, new lists can be created by applying various list manipulation operations to existing lists.

Lists in Haskell have many built-in functions and operators that allow you to perform various operations on them, such as appending elements, accessing elements, filtering, mapping, and folding over elements. These operations can be combined to solve complex problems efficiently using functional programming techniques.