4. Syntax in Functions

Patterns, guards, where, let, and case.

Sections

• Chapter 4 Reading Guide

Questions to help you understand Chapter 4.

• Chapter 4 Discussion I

Slideshow of Discussion problems for Chapter 4. Similar but not identical to reading guide questions.

• Chapter 4 Discussion II

Discussion on first half of the reading guide for Chapter 4.

• Chapter 4 Discussion III

Lots of problems so you can practice writing Haskell.

• Chapter 4 Discussion IV

A few practice problems from a Thursday review session.

• Chapter 4 Discussion V

In the game of Scrabble you try to fit a word into spaces with some letters already in place. In this question you will write a function to determine if a word fits into a certain space. wordFits :: String -> String -> Bool wordFits "jerk "_or_" == False wordFits "work" "__r_" == True Along the way you may want to use a helper function to determine if characters from the same place match.

• Chapter 4 Discussion VI

The alternating series is [1, -1/2, +1/3, -1/4, +1/5, -1/6, ...] Define altTerm n to be the nth term in the sequence. Define altSeq m to be the first first m terms in the sequence. Write a function to find the first k terms of the alternating series. Write waltSum, which takes in a list of numbers, multiplies each term by the corresponding term in the alternating series, and then adds up the sums.

• Chapter 4 Problem Set

Exercises to improve your Haskell programming.

• Chapter 4 Quiz C

Ten minute quiz.

• Chapter 4 Summary

patterns, guards, where, let, case

• Check Expects in Haskell

Simple testing in Haskell. Usable on repl.it.