Swift Coding Challenges
Introduction
About this book
Strings
- Challenge 1: Are the letters unique?
- Challenge 2: Is a string a palindrome?
- Challenge 3: Do two strings contain the same characters?
- Challenge 4: Does one string contain another?
- Challenge 5: Count the characters
- Challenge 6: Remove duplicate letters from a string
- Challenge 7: Condense whitespace
- Challenge 8: String is rotated
- Challenge 9: Find pangrams
- Challenge 10: Vowels and consonants
- Challenge 11: Three different letters
- Challenge 12: Find longest prefix
- Challenge 13: Run-length encoding
- Challenge 14: String permutations
- Challenge 15: Reverse the words in a string
Numbers
- Challenge 16: Fizz Buzz
- Challenge 17: Generate a random number in a range
- Challenge 18: Recreate the pow() function
- Challenge 19: Swap two numbers
- Challenge 20: Number is prime
- Challenge 21: Counting binary ones
- Challenge 22: Binary reverse
- Challenge 23: Integer disguised as string
- Challenge 24: Add numbers inside a string
- Challenge 25: Calculate a square root by hand
- Challenge 26: Subtract without subtract
Files
- Challenge 27: Print last lines
- Challenge 28: Log a message
- Challenge 29: Documents directory
- Challenge 30: New JPEGs
- Challenge 31: Copy recursively
- Challenge 32: Word frequency
- Challenge 33: Find duplicate filenames
- Challenge 34: Find executables
- Challenge 35: Convert images
- Challenge 36: Print error lines
Collections
- Challenge 37: Count the numbers
- Challenge 38: Find N smallest
- Challenge 39: Sort a string array by length
- Challenge 40: Missing numbers in array
- Challenge 41: Find the median
- Challenge 42: Recreate firstIndex(of:)
- Challenge 43: Linked lists
- Challenge 44: Linked list mid-point
- Challenge 45: Traversing the tree
- Challenge 46: Recreate map()
- Challenge 47: Recreate min()
- Challenge 48: Implement a deque data structure
- Challenge 49: Sum the even repeats
- Challenge 50: Count the largest range
- Challenge 51: Reversing linked lists
- Challenge 52: Sum an array of numbers
- Challenge 53: Linked lists with a loop
- Challenge 54: Binary search trees
Algorithms
- Challenge 55: Bubble sort
- Challenge 56: Insertion sort
- Challenge 57: Isomorphic values
- Challenge 58: Balanced brackets
- Challenge 59: Quicksort
- Challenge 60: Tic-Tac-Toe winner
- Challenge 61: Find prime numbers
- Challenge 62: Points to angles
- Challenge 63: Flood fill
- Challenge 64: N Queens
Appendix: Be the Compiler
Test your Swift reading skills with multiple-choice questions: choose a difficulty level, write down your answers to each question, then mark yourself at the end.
