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Swapna Kumar Panda ✨ Profile picture
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9 Dec, 5 tweets, 1 min read
💙 Built-In Data Structures

⇰ C++
⇰ Java
⇰ JavaScript
⇰ Python

Let's explore 👀

⇩
1️⃣ C++

The STL provides

⇥ array
⇥ vector
⇥ stack
⇥ queue
⇥ deque
⇥ priority_queue
⇥ forward_list
⇥ list
⇥ Set
⇥ unordered_set
⇥ multiset
⇥ unordered_multiset
⇥ Map
⇥ unordered_map
⇥ multimap
⇥ unordered_multimap
2️⃣ Java

⇥ ArrayList
⇥ LinkedList
⇥ HashSet
⇥ LinkedHashSet
⇥ TreeSet
⇥ HashMap
⇥ LinkedHashMap
⇥ WeakHashMap
⇥ TreeMap
⇥ Stack
⇥ PriorityQueue

Check "java.util" package. There are way too many classes/interfaces.
3️⃣ JavaScript

⇥ Array
⇥ Set
⇥ WeakSet
⇥ Object Literal
⇥ Map
⇥ WeakMap
4️⃣ Python

⇥ list
⇥ tuple
⇥ set
⇥ frozenset
⇥ dictionary

• • •

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More from @swapnakpanda

Swapna Kumar Panda ✨ Profile picture
7 Dec
💜 Strings in JavaScript

String
↳ Primitive
↳ String Literals
↳ Single Quotes
↳ Double Quotes
↳ Back Tick
↳ String()
↳ Object
↳ new String()

Full Details Inside.

⇩
Let's explore

1️⃣ Primitive vs Object Type
2️⃣ Auto Convertible
3️⃣ Immutable
4️⃣ Easily Comparable
5️⃣ Array-Like
6️⃣ Spreadable
7️⃣ Possible to Destructure
1️⃣ Primitive vs Object Type

✪ In JavaScript, a string value can either be a primitive or, an object.

✪ What is Primitive?
A primitive is a data that is not an object and has no methods.
Read 13 tweets
Swapna Kumar Panda ✨ Profile picture
4 Dec
💙 Are you new to DSA?

Attempt these 20 simple problems today to make your "logic building" strong.

⇩
1️⃣ Recursion

✪ Print a pattern (eg. triangle of numbers/asterisks)
✪ Sum of digits of a number
✪ Sum of natural numbers
✪ Factorial of a number
✪ Print Fibonacci Sequence
✪ Check if a string/number is palindrome
✪ Reverse a string/number/array
2️⃣ Divide and Conquer

✪ Find exponential of a number
✪ Search element in a sorted array/matrix
✪ Floor in a sorted array
✪ Merge 2 sorted arrays to create another sorted array
✪ Find median of 2 sorted arrays (same & different size)
✪ kth element in 2 sorted arrays
Read 4 tweets
Swapna Kumar Panda ✨ Profile picture
3 Dec
💜 JavaScript Cheat Sheet

Converting any type of data to a Number, String and Boolean type.

⇩
There are few entries in the above cheat sheet that are marked with "Red Lines". That has a purpose.

Many would guess the output incorrectly. So those are for your attention.
If you want to check the v1.0 of this cheat sheet (which was published in September), check 👇

Read 5 tweets
Swapna Kumar Panda ✨ Profile picture
2 Dec
💙 NaN in JavaScript

Operations evaluating to NaN
↳ Conversion to a Number
↳ Parsing to a Number
↳ Indeterminate Forms
↳ Math functions

Let's explore.

⇩
1️⃣ Conversion to a Number

Conversion happens in 2 ways in JavaScript

↳ Implicit Conversion
Operations where a number is expected
Example: Unary +, Binary - etc
↳ Explicit Conversion
Using Number() or, new Number()

Let's see what are evaluated to NaN Image
2️⃣ Parsing to a Number

There are 2 number parsing methods

↳ parseInt
↳ parseFloat

The process is,

✪ Leading and trailing spaces are ignored
✪ If the first character cannot be converted to a number, NaN is returned
✪ Only the first number found is returned
Read 5 tweets
Swapna Kumar Panda ✨ Profile picture
1 Dec
🙏 🙏 🙏 🙏 🙏

Thank you November. More contents coming in December which you wouldn't like to miss.

⇨ DSA
⇨ SQL / NoSQL
⇨ JavaScript
⇨ HTML / CSS
⇨ Python
⇨ System Design

I will share everything from my 15 years of experience. Want to know more about me?

⇩ Image
↱ ↰
TECH STACK
↳ ↲

⇰ 2001-2006
↳ C🔹C++🔸DSA🔹Oracle

⇰ 2006-2016
↳ Java🔹JavaScript🔸HTML/CSS
↳ REST🔹MQs

⇰ 2016-2021
↳ React🔹MongoDB🔸GraphQL
↳ Python🔸ML
↳ Git🔹Cloud Computing
↱ ↰
FUTURE LEARNING
↳ ↲

⇰ 2022-~
↳ Docker🔹Kubernetes🔸Microservices
↳ Web 3🔹Blockchain🔸Ethereum
↳ Solidity🔹Rust

+++
Read 4 tweets
Swapna Kumar Panda ✨ Profile picture
29 Nov
💙 7 Types of Algorithms

↳ Brute Force
↳ Recursive
↳ Divide & Conquer
↳ Greedy
↳ Dynamic
↳ Backtracking
↳ Randomised

⇩
1️⃣ Brute Force Algorithm

✪ It is the most common type of algorithm. Every problem can be solved by brute force approach although generally not most effective.

✪ To design an optimal solution, we need to get a solution first at least and then it may be optimised.
2️⃣ Recursive Algorithm

✪ Recursion simply means calling itself to solve its subproblems.

Example: Factorial(n) = n * Factorial(n-1)
Read 10 tweets

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