Learn Rust by typing · CodeTypeLearn

1Fundamentals0/42start →

Hello, Rust Floats, bool, char for over a range Integer types Type limits Bindings while loop Casting with as for with enumerate Functions loop with a value Option Parse from text Search within text Split a string Trim and change case unwrap & expect while let Borrowing (&)Clone Copy vs move Enums with data if let & matches!Read a line from stdin Labeled loops Match a Result Mutable borrow (&mut)Option fallbacks Overflow handling Result Join and split lines Durations Measure elapsed time Read and parse a number Write to stdout and stderr Iterators The ? operator Scope and drop Slices Seconds since the epoch A custom error type Option and match

2Strings In Depth0/18start →

String to &str and back Build a String by pushing Compare String and &str Build without moving Ways to make a String String vs &str Return an owned String Take &str, accept both Slice by byte index Concatenate with +There is no s[0]Grow a caller's String split yields borrows Mind char boundaries Return a borrowed &str Accept any string-like type Borrow or own with Cow A struct that borrows text

3Values & References0/18start →

Borrow to read Clone to keep both Copy types are duplicated Value vs reference Dereference with *Borrow just one field Passing by value moves Mutable borrow Borrow instead of moving big data Slices are borrows Box: an owned heap pointer Make a struct Copy Pass a &mut onward Return a reference Own vs borrow: the API choice Shared xor mutable Rc: shared ownership A raw pointer

4Slices & Arrays0/18Unlock →

Arrays contains Reverse in place fill Safe access Slice a range Sort in place concat and join dedup Find an index Rotate sort_by_key split_at split_first swap and copy_from_slice binary_search chunks windows

5Data structures0/64Unlock →

Array & slice: create Array & slice: iterate Array & slice: retrieve String: create & push Vec: create Vec: insert Vec: retrieve VecDeque: insert VecDeque: iterate VecDeque: retrieve VecDeque: remove HashMap: insert HashMap: retrieve HashSet: filter HashSet: insert HashSet: retrieve Array & slice: filter Array & slice: sort String: concatenate String: find / contains String: remove / truncate String: replace String: retrieve Vec basics Vec: filter Vec: remove / erase Vec: sort Vec: update Box: heap allocation BTreeMap: insert BTreeMap: iterate sorted BTreeMap: retrieve BTreeMap: remove BTreeSet: insert BTreeSet: min & max BTreeSet: remove HashMap word count HashMap: insert-or-update HashMap: filter HashMap: remove / erase HashMap: sort entries HashMap: update HashSet dedup HashSet: set operations HashSet: remove / erase BinaryHeap: remove (max first)BinaryHeap: insert BinaryHeap: sort LinkedList: filter LinkedList: insert LinkedList: retrieve LinkedList: remove String: sort characters BTreeMap keeps order BTreeMap: range query BTreeSet: range / retrieve BinaryHeap: min-heap Rc: shared ownership VecDeque as a queue Box<dyn Trait>: trait objects Enums and match A generic stack Rc<RefCell>: shared mutability A binary tree with Box

6Iterators0/20Unlock →

7Traits0/20Unlock →

8Generics0/20Unlock →

9Lifetimes0/20Unlock →

10Closures0/20Unlock →

11Pattern Matching0/20Unlock →

12Error Handling0/20Unlock →

13Option & Result0/20Unlock →

14Conversions0/15Unlock →

Value to String bool as a number chars to String Numeric cast with as parse with a turbofish String to Vec<char>Slice to Vec Byte and char collect needs a target Float to int truncates Flexible Into param usize and i32 TryFrom for narrowing Vec to array FromStr for your type

15Collection Conversions0/19Unlock →

Flatten nested Vecs Map keys to Vec Map values to Vec Pairs to a map HashSet to sorted Vec Vec to BTreeSet Vec to VecDeque Vec to HashSet Boxing and unboxing Vec to frequency map Map keys to a HashSet HashMap to BTreeMap Map to Vec of pairs Two Vecs to a map Vec and boxed slice Unique, keeping order Group a Vec into a map Invert a map A Vec of trait objects

16Math0/46Unlock →

Math constants Float functions Integer arithmetic min, max, clamp Rounding Average of a slice Degrees and radians Factorial Fractional part Logarithms & exp Next power of two abs_diff & signum Trigonometry Angle of a point Bit math Copy a sign Euclidean division Dot product Comparing floats Euclidean div & mod Hyperbolic functions hypot & atan2 Integer logarithm Inverse trigonometry Integer square root Linear interpolation Logarithm in any base NaN and infinity checks Vector magnitude Reciprocal and fused multiply-add Bit rotation Round to N decimals Min, max and range of a slice Reverse bytes and bits Min/max of floats GCD and LCM Primality test Median Mode Overflowing arithmetic Remap a range Sort floats with total_cmp Variance and standard deviation Combinations (nCr)Sieve of Eratosthenes Convert to any base

17Encoding0/22Unlock →

18Random0/20Unlock →

19Data I/O0/18Unlock →

Parse CSV into rows Tab-separated values Build a CSV string Select one column CSV into a number matrix Split off the header Whitespace-separated matrix Read a data file Serialize records to CSV Skip blanks and comments Print an aligned table Write CSV to a file Write a matrix as text Append a row Stream lines with BufReader Parse key=value config Round-trip write then read Drop unparseable rows

20Linear Algebra0/21Unlock →

21Text Processing0/16Unlock →

Word count Count occurrences Strip all whitespace Replace text Reverse word order Count vowels Zero-pad a number Pad and align Capitalize the first letter Character frequency Byte offset of each char Longest word Number the lines Title case Truncate with an ellipsis Levenshtein distance

22Date & Time0/24Unlock →

23Memory0/12Unlock →

Drop a value early Swap two values Replace and return the old Size of a type Take, leaving the default Cell for interior mutability Reference counting Clone-on-write Lazy static value Initialize once RefCell borrows at runtime Weak references

24Modules0/20Unlock →

25Macros0/20Unlock →

26Testing0/20Unlock →

27Algorithms0/10Unlock →

Greatest common divisor Reverse a string Binary search Pseudo-random numbers Palindrome check Fibonacci with memoization Merge two sorted slices Fisher-Yates shuffle Two sum Quicksort

28Sorting Algorithms0/12Unlock →

Check if sorted Standard library sorts Bubble sort Sort by key and descending Insertion sort Selection sort Counting sort Merge sort Shell sort Heapsort Quicksort Radix sort

29Expression Parsing0/6Unlock →

Evaluate postfix (RPN)Tokenize an expression Evaluate infix Recursive-descent calculator Right-associative power Shunting-yard

30Idioms0/9Unlock →

Iterator chains while let Fold Match with guards Option combinators Result and the ? operator Traits with default methods Returning closures Lifetimes

31OOP & Traits0/8Unlock →

Encapsulation Traits are interfaces Composition over inheritance Default methods Implementing Display Dynamic polymorphism Static polymorphism Supertraits

32Trait Objects0/14Unlock →

Return Box<dyn Trait>Default methods via dyn Take a &dyn Trait Box<dyn Fn>impl Trait vs Box<dyn>Shared trait object A slice of trait objects impl vs dyn Supertrait object A Vec of trait objects Downcast with Any Trait object with a lifetime Object-safe traits A handler registry

33Design Patterns0/14Unlock →

Prototype Factory Method Adapter Builder Lazy Initialization Singleton Strategy Command Decorator Dependency Injection Observer Object Pool State Actor

34Async0/3Unlock →

async blocks async fn and await Many futures

35File I/O0/6Unlock →

Read a file Write a file Append with OpenOptions Read lines with BufReader Count lines Buffered writing

36Filesystem0/18Unlock →

Does a path exist?Copy a file Create nested directories Files vs directories Build a path List a directory Rename or move Change the extension File metadata Path components Remove files and trees Sorted listing Write to the temp dir Absolute path Filter by extension Last modified time Total size of a tree Walk the tree

37Networking0/16Unlock →

Parse the request line Route by path Classify an IP address Parse a socket address Bind an ephemeral port Build an HTTP response Read a line from a stream Resolve a hostname Shut down a connection TCP client Read timeout UDP receive UDP send A thread per connection TCP echo server Host a web page

38Concurrency0/25Unlock →

39Unsafe & FFI0/14Unlock →

Dereference a raw pointer An unsafe function A function pointer C strings Call a C function Export a function to C const and mut raw pointers Mutable static into_raw and from_raw Slice from raw parts MaybeUninit Pointer arithmetic transmute the bits A union

40Commands0/14Unlock →

Command-line arguments Skip the program name Env var with a default Read an environment variable Current directory Iterate all env vars Set and remove a variable Path to this executable Exit with a code Pass env to a child Run a command Spawn and wait Command exit status Read all of stdin

41Array0/10Unlock →

Contains Duplicate Two Sum Best Time to Buy and Sell Stock Maximum Subarray Container With Most Water Find Minimum in Rotated Sorted Array Product of Array Except Self Maximum Product Subarray Search in Rotated Sorted Array 3Sum

42Binary0/5Unlock →

Missing Number Number of 1 Bits Counting Bits Reverse Bits Sum of Two Integers

43String0/10Unlock →

Valid Anagram Valid Palindrome Valid Parentheses Encode and Decode Strings Group Anagrams Longest Substring Without Repeating Characters Longest Repeating Character Replacement Longest Palindromic Substring Palindromic Substrings Minimum Window Substring

44Matrix0/4Unlock →

Rotate Image Set Matrix Zeroes Spiral Matrix Word Search

45Interval0/5Unlock →

Meeting Rooms Merge Intervals Insert Interval Non-overlapping Intervals Meeting Rooms II

46Linked List0/6Unlock →

Reverse Linked List Linked List Cycle Merge Two Sorted Lists Remove Nth Node From End Merge K Sorted Lists Reorder List

47Tree0/14Unlock →

Maximum Depth of Binary Tree Invert Binary Tree Same Tree Lowest Common Ancestor of a BST Binary Tree Level Order Traversal Subtree of Another Tree Implement Trie (Prefix Tree)Kth Smallest Element in a BST Validate Binary Search Tree Add and Search Word Construct Binary Tree from Preorder and Inorder Binary Tree Maximum Path Sum Serialize and Deserialize Binary Tree Word Search II

48Graph0/8Unlock →

Number of Connected Components Number of Islands Clone Graph Course Schedule Longest Consecutive Sequence Graph Valid Tree Alien Dictionary Pacific Atlantic Water Flow

49Heap0/3Unlock →

Kth Largest Element in an Array Top K Frequent Elements Find Median from Data Stream

50Dynamic Programming0/11Unlock →

Climbing Stairs House Robber Unique Paths Coin Change House Robber II Jump Game Combination Sum IV Decode Ways Longest Common Subsequence Longest Increasing Subsequence Word Break