Best Haskell Programming Books to Buy in January 2026
Programming in Haskell
Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming
Learn Physics with Functional Programming: A Hands-on Guide to Exploring Physics with Haskell
Real World Haskell
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Get Programming with Haskell
Production Haskell: Succeeding in Industry with Haskell
Parallel and Concurrent Programming in Haskell: Techniques for Multicore and Multithreaded Programming
Haskell: The Craft of Functional Programming (International Computer Science Series)
Thinking Functionally with Haskell
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.