- Trinket.io for JavaScript
- Draw a triangle
- Draw it using sequential method calls
- Draw it using a loop
- Draw a second triangle
- Draw them using a function
- Draw different-sized triangles ... etc
TODO: Rate these in terms of week 1-9
- Make it one big function
- Lots of duplication
- Bad variable names
Have them
- Figure out what the code is doing
- Identify responsibilities
- Compose from abstract to concrete
Ask
- What does this code do?
- How could it be improved?
- What are its responsibilities?
Cash paying customers are rare these days, and cashiers have lost the ability to calculate proper change. Our client has asked us to write an app to help their employees calculate how much change to give cash-paying customers.
The function should attempt to give as many big denominations as possible.
// makeChange(32.30, 50)
// returns [
// { unit: '$10', qty: 1 },
// { unit: '$5', qty: 1 },
// { unit: '$1', qty: 2 },
// { unit: 'c25', qty: 2 },
// { unit: 'c10', qty: 2 }
// ]
function makeChange(price, cash) {
}
Write a function that computes the factorial of a number. For example, the factorial of 5 is 5 * 4 * 3 * 2 * 1
// factorial(5)
// returns 120;
function factorial(n) {
}
Implement the rotateArray function:
// Rotates the specified array by n positions
// rotateArray(2, ['a', 'b', 'c', 'd', 'e'])
// returns ['c', 'd', 'e', 'a', 'b']
// rotateArray(-1, ['a', 'b', 'c'])
// returns ['c', 'a', 'b']
function rotateArray(n, arr) {
}
Implement a function to find all anagrams in an array. An anagram is a word which is formed by rearranging the letters of another word
'shack' 'hacks'
Need to have a dictionary of words (might use the one from the hangman game).
Implement an object that represents currency via integer rather than float to eliminate floating point mathematical errors.
Numerals on a phone can represent both numbers and letters:
1: 1
2: 2, A, B, C
3: 3, D, E, F
4: 4, G, H, I
5: 5, J, K, L
6: 6, M, N, O
7: 7, P, Q, R
8: 8, S, T, U
9: 9, V, W, X
0: 0, Y, Z
Implement a function which is given a sequence of numerals and an array of words. The function returns the subset of the array such that each word in the subset begins with the letters represented by the digits.
// Filters the array based on the numerals in s
// phoneFilter('22', ['dog', 'cat', 'tack', 'action'])
// returns ['cat', 'action']
function phoneFilter(s, arr) {
}
Implement a function that returns the longest word in a string. If there is a tie, return the first word.
// longestWord('Hello, world and everyone')
// returns 'everyone'
function longestWord(s) {
}
Implement a function that returns the unique set of words (case-insensitive) in a string.
// uniqueWords('Hello, George; hello, Jane')
// returns ['hello', 'george', 'jane']
function uniqueWords(s) {
}
You've been hired by Scrabble to analyze how many of each letter they should include in a game. The decision will be based on how common any given letter is.
To determine this, write a function which when given a long string, computes the frequency of each character in the range of a-z. Ignore case. Try your function on a big block of text (such as the content of a free e-book).
Implement a function that counts how many times each word occurs in a string. It should ignore case.
// wordCount('The cat, the dog, and the other dog...')
// returns [{ word: 'the', count: 3 }, { word: 'cat', count: 1 }, { word: 'dog', count: 2 }, { word: 'and', count: 1}, { word: 'other', count: 1 }]
function wordCount(s) {
}
Implement a function which, when given a day and year returns the month and day.
// monthAndDay(2015, 34)
// returns { month: 2, day: 3 }
function monthAndDay(day, year) {
}
Implement a function which is given a string and a dictionary and returns an array of words from the string which were not found in the dictionary.
// spellCheck('Hello, baz', ['hello', 'world', 'the', 'and'])
// returns ['baz']
function spellCheck(arr, dict) {
}
FairFlare is a startup that helps fairs and festivals with passes. They need an easier way to print will-call tickets. Their customer information is available in the following format:
First name, last name, level
An example dataset might look like this:
Sally, Silversteen, gold
James, Johnson, silver
Jane, Doe, silver
Bob, Marley, platinum
Festivals who use FairFlare would like to be able to customize their tickets.
Write an application which allows a user to select two files: the customer information CSV file and the ticket template file, then generates a printable list of tickets.
You can decide how ticket templates might work, but here's a pretty common template format:
Barnam and Bailey's Circus
{{level}} pass for {{lastName}}, {{firstName}}
7-segment displays are displays that represent numbers using 7 segments:
|_|
|_|
Write a function which, given two integers, returns a 7-segment representation.
function seg7(n1, n2) {
}
If we were to call it like this seg7(8, 7), it would produce:
|_| . |
|_| . |
Draw a grid of squares (which will simulate pixels) on the screen. Given a formula, graph it on the grid of squares.
// To draw a parabola:
// graph(function (y) { return y * y; });
function graph(fnx) {
}
- Square grid with one piece missing
- Randomly jumbled image
- Move squares around to get the right image
- http://en.wikipedia.org/wiki/15_puzzle
Write a function fizzbuzz which produces an array of numbers from 1 to 100,
but for multiples of three the array contains the string 'fizz' instead of the
number and for the multiples of it contains 'buzz'. For numbers which are
multiples of both three and five print 'fizzbuzz'.
So this: fizzbuzz()
Would return an array with 100 items, the first 16 of which would be:
1, 2, 'Fizz', 4, 'Buzz', 'Fizz', 7, 8, 'Fizz', 'Buzz', 11, 'Fizz', 13, 14, 'FizzBuzz', 'Fizz'
- Objects to simulate tables and joins
- Given a CSV of survey results, compute summary info (p30 programming pearls)
Cool program to spell check
sign < dictionary | sort | squash > gramlist