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You are here: Home » Design Patterns » Strategy Design Pattern

Design Sorting algorithm using Strategy Design Pattern

Varun January 18, 2015 Design Sorting algorithm using Strategy Design Pattern2015-09-25T00:14:18+05:30 Behavioral Design Patterns No Comment
What is a Strategy? Strategy is a plan of action designed to achieve a long-term or overall aim. (more…)
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Binary Tree Traversal with Strategy design pattern and open-closed principle

Varun July 31, 2014 Binary Tree Traversal with Strategy design pattern and open-closed principle2015-09-25T00:14:20+05:30 Binary Tree 3 Comments
Many time we need to perform certain tasks on Binary trees. These tasks can be, Counting nodes that satisfy some criteria. Displaying all nodes in particular pattern like, printing expression…
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Design Patterns

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    • Observer Design Pattern
    • State Design Pattern
    • Strategy Design Pattern
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Python : List

  • Check if an item exists in List
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  • Sort a list of tuples by 2nd Item
  • Sort a list of strings
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  • Merge / Join two or more lists
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  • Convert a list to string
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  • Remove multiple elements from list

Python : Dictionary

  • Creating Dictionaries in Python
  • Iterating over Dictionaries in Python
  • Check if a key exists in Dictionary
  • Get list of all the keys in Dictionary
  • Get list of all the Values in a Dictionary
  • Remove multiple keys in Dictionary while Iterating
  • Remove a key from Dictionary
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  • Sort a Dictionary by key or Value
  • Copy a dictionary | Shallow vs Deep Copy
  • Convert a list to dictionary
  • Filter a dictionary by conditions on keys or values
  • Python : How to get all keys with maximum value in a Dictionary
  • How to Merge two or more Dictionaries in Python ?

Python Strings

  • Access characters in string by index in Python
  • Iterate over the characters in string
  • How to Replace characters in a string ?
  • How to remove characters from a string by Index ?
  • How to pad strings with zero, space or some other character in Python
  • How to Compare Strings ? | Ignore case | regex | is vs == operator using Python
  • Find occurrence count & all indices of a sub-string in another string | including overlapping sub-strings
  • Check if a String contains a sub string & find it’s index | case insensitive
  • Find frequency of each character in string and their indices | Finding duplicate characters in a string
  • How to create multi line string objects in python ?
  • Count occurrences of a single or multiple characters in string and find their index positions

Java – Hashmap

  • What is Hashing and Hash Table?
  • Associating Multiple values with same Key
  • Remove elements while Iterating
  • Update the value of an existing key
  • Get all keys by a value in HashMap

Java – HashSet

  • What is Hashing and Hash Table?
  • Create and add elements in a HashSet
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Java Interview Questions

  • Method Overriding Tutorial
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C++11 – Utilities

  • Deleting Functions using ‘delete’ keyword
  • std::bind
  • auto specifier
  • Variadic Templates

C++11 – Unordered Set

  • 1.) unordered_set Basic Example
  • 2.) Initializing an unordered_set
  • 3.) Inserting elements in an unordered_set
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  • 5.) unordered_set – Custom Hasher & Comparator
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C++11 – UnorderedMap

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C++11 Smart Pointers

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  • weak_ptr Tutorial | shared_ptr and Cyclic References
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C++11 Multithreading

  • Part 1: Three Ways to Create Threads
  • Part 2: Joining and Detaching Threads
  • Part 3: Passing Arguments to Threads
  • Part 4 : Sharing Data & Race Conditions
  • Part 5 : Fixing Race Conditions using mutex
  • Part 6 : Need of Event Handling
  • Part 7: Condition Variables
  • Part 8: std::future and std::promise
  • Part 9: std::async Tutorial & Example
  • Part 10: std::packaged_task<> Tutorial

C++11 Rvalue References

  • lvalue vs rvalue
  • Is rvalue immutable in C++?
  • What is rvalue reference in C++11
  • Move Contsructor

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Design Patterns

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    • Observer Design Pattern
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    • Strategy Design Pattern
  • Structural Design Patterns
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    • Flyweight Design Pattern
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Pointers

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Callbacks in C++

  • Function Pointers
  • Function Objects & Functors

C++ Strings

  • Find and Replace all occurrences of a string
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  • Case Insensitive string::find
  • Convert First Letter of each word to Upper Case
  • Converting a String to Upper & Lower Case
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  • C++ : How to split a string using String and character as Delimiter?
  • startsWith() Implementation
  • endsWith() Implementation
  • Remove Sub Strings from String

C++ Memory Manangement

  • Memory Leaks
  • new and delete operator
  • delete vs []delete
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  • Overload new & delete
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  • Placement new operator
  • Delete ‘this’ pointer

Polymorphism

  • Virtual Functions
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STL – Vector

  • 1.) What’s std::vector and why to use it?
  • 2.) Different ways to initialize a vector
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  • 9.) Hidden cost of std::vector
  • 10.) Adding elements in Vector

STL – Deque

  • 1.) What is std::deque and how deque works internally.
  • 2.) deque vs vector : What to choose ?

STL – List

  • 1.) std::list Internals & Usage Details
  • 2.) List vs Vector
  • 3.) Different ways to Initialize a list
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  • 5.) Remove elements while Iterating
  • 6.) Remove elements based on External Criterion
  • 7.) Get element by index in List
  • 8.) Searching an element in std::list
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  • 10.) Sorting a List & custom Comparator

STL – Set

  • 1.) C++ Set basic example and Tutorial
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  • 3.) std::set and external Sorting criteria | Comparator
  • 4.) Access Element by index in Set
  • 5.) How to insert elements in Set
  • 6.) How to iterate over a Set
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  • 8.) Erase elements while Iterating & Generic erase_if()

STL – Map

  • 1.) std::map Usage Detail with examples
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  • 4.) Set vs Map
  • 5.) How to Iterate over a map in C++
  • 6.) Map Insert Example
  • 7.) Iterate a map in reverse order
  • 8.) Check if a key exists in a Map
  • 9.) Search by value in a Map
  • 10.) Erase by Key | Iterators
  • 11.) C++ Map : Operator []
  • 12.) Erase by Value or callback
  • 13.) copy all Values from a Map to vector

STL Multimap

  • MultiMap Example and Tutorial
  • multimap::equals_range – Tutorial

STL Algorithms

  • std::sort Tutorial & Example
  • std::unique Tutorial & Example
  • 1.) Using std::find & std::find_if with User Defined Classes
  • 2.) Iterating over a range of User Defined objects and calling member function using std::for_each

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