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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
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    • Strategy Design Pattern
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Python : List

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  • Sort a list of strings
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  • Merge / Join two or more lists
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  • Remove multiple elements from list

Python : Dictionary

  • Creating Dictionaries in Python
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  • Check if a key exists in Dictionary
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  • 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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  • Copy a dictionary | Shallow vs Deep Copy
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Python Strings

  • Access characters in string by index in Python
  • Iterate over the characters in string
  • How to Replace characters in a string ?
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  • 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
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  • Update the value of an existing key
  • Get all keys by a value in HashMap

Java – HashSet

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  • Create and add elements in a HashSet
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Java Interview Questions

  • Method Overriding Tutorial
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C++11 – Utilities

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  • auto specifier
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C++11 – Unordered Set

  • 1.) unordered_set Basic Example
  • 2.) Initializing an unordered_set
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  • 5.) unordered_set – Custom Hasher & Comparator
  • 6.) Unordered_set & User defined classes

C++11 – UnorderedMap

  • Basic Usage Detail and Example
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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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Pointers

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Callbacks in C++

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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
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  • C++ : How to split a string using String and character as Delimiter?
  • startsWith() Implementation
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  • Remove Sub Strings from String

C++ Memory Manangement

  • Memory Leaks
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  • delete vs []delete
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Polymorphism

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STL – Vector

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  • 7.) Remove repeated elements from a vector
  • 8.) Fill a vector with random numbers
  • 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
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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
  • 2.) Using std::set with user defined classes
  • 3.) std::set and external Sorting criteria | Comparator
  • 4.) Access Element by index in Set
  • 5.) How to insert elements in Set
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  • 7.) Removing an element from Set
  • 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
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  • 6.) Map Insert Example
  • 7.) Iterate a map in reverse order
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  • 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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