Programming Tech Brief By HackerNoon

Programming Tech Brief By HackerNoon

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Programming Tech Brief By HackerNoon episodes

  • How to Update Object Key Values Using Javascript

    This story was originally published on HackerNoon at: https://hackernoon.com/how-to-update-object-key-values-using-javascript.


    Javascript objects consist of key-value pairs and are one of the most common data structures in Javascript.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #javascript, #javascript-development, #web-development, #webdev, #typescript, #javascript-tutorial, #tutorial, #programming-languages, and more.


    This story was written by: @smpnjn. Learn more about this writer by checking @smpnjn's about page,
    and for more stories, please visit hackernoon.com.


    To update all values in an object, the easiest way is to:
    Use Object.keys to get all keys of the object.
    Apply any logic, to decide which values should be updated.
    Update the value of each using a loop-like forEach or for.

    2 min
  • Clone Graph Blind75 LeetCode Problem

    This story was originally published on HackerNoon at: https://hackernoon.com/clone-graph-blind75-leetcode-problem.


    Clone Graph Blind75 LeetCode Problem
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #java, #data-structures, #leetcode, #algorithms, #dfs, #programming, #graph, #blind75, #hackernoon-es, and more.


    This story was written by: @rakhmedovrs. Learn more about this writer by checking @rakhmedovrs's about page,
    and for more stories, please visit hackernoon.com.


    Task description: Given a reference of a node in a connected(https://en.wikipedia.org/wiki/Connectivity)Connected_graph) Return a deep copy of the graph. Each node in the graph contains a value (`int`) and a list (`ListNode`) of its neighbors. The graph is represented in the test case using an adjacency list. The given node will always be the first node with `val = 1` You must return the copy of a given node as a reference to the cloned graph.

    4 min
  • 3 Ways to Crack WinRAR Password Protected Files

    This story was originally published on HackerNoon at: https://hackernoon.com/3-ways-to-crack-winrar-password-protected-files-5a3r34nw.


    This article will explain the 3 best methods to recover WinRAR password protected files.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #programming, #zip, #winrar, #passwords, #password-security, #computer-errors, #computer-tips, #hacking, #hackernoon-es, and more.


    This story was written by: @khatri. Learn more about this writer by checking @khatri's about page,
    and for more stories, please visit hackernoon.com.


    This article will explain the 3 best methods to recover WinRAR password protected files. You can use Notepad or Notepad to recover your password-protected files without software in this article. If you don’t remember your password, you can follow the below-mentioned steps to break your RAR password with frequently-used ones. The last one, we will discuss some of the best ways to open your files without any software in the article. The best method is to use an online password unlocker, for example, Unzip-online, LossMyPass, Password Online Recovery, or RAR Password Recovery.

    4 min
  • Java Algorithms: Copying List with Random Pointer (LeetCode)

    This story was originally published on HackerNoon at: https://hackernoon.com/java-algorithms-copying-list-with-random-pointer-leetcode.


    A linked list of length n is given such that each node contains an additional random pointer, which could point to any node in the list, or null.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #programming, #java-programming, #leetcode, #linked-lists, #programming-tips, #coding, #coding-challenge, #debugging, #hackernoon-es, and more.


    This story was written by: @rakhmedovrs. Learn more about this writer by checking @rakhmedovrs's about page,
    and for more stories, please visit hackernoon.com.


    Let’s start from solving the first subproblem. Let’s do simple thing iterate through linked list and create a copy for every node in it. I choose HashMap for storing pairs like old node -> new node. As long as we’re going to iterate from head of the list to tail let’s also introduce temp variable and set it to be the head of the list.

    4 min
  • How to Find the Product of All Elements in an Array Except Self - Blind 75 LeetCode

    This story was originally published on HackerNoon at: https://hackernoon.com/how-to-find-the-product-of-all-elements-in-an-array-except-self-blind-75-leetcode.


    How to Find the Product of All Elements in an Array Except Self? You must write an algorithm that runs in O(n) time and without using the division operation.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #programming, #java-programming, #leetcode, #arrays, #programming-tips, #coding, #coding-interviews, #coding-challenge, #hackernoon-es, and more.


    This story was written by: @rakhmedovrs. Learn more about this writer by checking @rakhmedovrs's about page,
    and for more stories, please visit hackernoon.com.


    Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[I]. The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer. You must write an algorithm that runs in O(n) time and without using the division operation.

    4 min
  • How to Solve Number of Islands From Blind 75 LeetCode Questions

    This story was originally published on HackerNoon at: https://hackernoon.com/how-to-solve-number-of-islands-from-blind-75-leetcode-questions.


    We will learn how to solve "Number of Islands" from Blind 75 LeetCode Questions.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #java, #data-structures, #leetcode, #algorithms, #dfs, #programming, #java-programming, #learn-programming, #hackernoon-es, and more.


    This story was written by: @rakhmedovrs. Learn more about this writer by checking @rakhmedovrs's about page,
    and for more stories, please visit hackernoon.com.


    Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are surrounded by water.

    4 min
  • How to Build a 2FA Application in Python

    This story was originally published on HackerNoon at: https://hackernoon.com/how-to-build-a-2fa-application-in-python.


    Sometimes the best way to learn how to code something is by looking at an example, so we’ve created a sample application on GitHub.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #plivo, #good-company, #programming, #technology, #2fa, #two-factor-authentication, #python, #cybersecurity, #hackernoon-es, and more.


    This story was written by: @plivo. Learn more about this writer by checking @plivo's about page,
    and for more stories, please visit hackernoon.com.


    It’s easier than you might think to add two-factor authentication (2FA) to your applications. The secret is to use APIs provided by a cloud communications platform like Plivo.
    Sometimes the best way to learn how to code something is by looking at an example, so we’ve created a sample application on GitHub.
    To use it, you need a Plivo account; you can sign up for free and get enough free credits to lease a phone number with which to send or receive messages and build some starter applications.
    If this is your first time using Plivo APIs, Plivo’s documentation provides instructions on how to set up a Python development environment, including installing the Plivo Python SDK, setting up a Flask server, and installing ngrok, which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels.

    3 min
  • Java Algorithms: Coding a Binary Tree Right Side View (LeetCode)

    This story was originally published on HackerNoon at: https://hackernoon.com/java-algorithms-coding-a-binary-tree-right-side-view-leetcode.


    In this article, you will learn how to code a Binary Tree Right side view in LeetCode.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #javascript, #java, #leetcode, #computer-science, #data-structures, #algorithms, #competitive-coding, #programming, #hackernoon-es, and more.


    This story was written by: @rakhmedovrs. Learn more about this writer by checking @rakhmedovrs's about page,
    and for more stories, please visit hackernoon.com.


    Given the root of a binary tree, imagine yourself standing on the right side of it. Then, return the values of the nodes you can see ordered from top to bottom. I would say it’s a pretty popular question during coding interviews Using simple words — think of the level for a particular node in a binary tree as the depth of that node. This code gives us linear time and space complexity, and it performs pretty well.

    3 min
  • How To Merge Two Sorted Lists

    This story was originally published on HackerNoon at: https://hackernoon.com/how-to-merge-two-sorted-lists.


    We can use LinkedList to merge both sorted lists, though there are considerations to doing it single or double-linked that may complicate the operation.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #leetcode, #data-structures, #computer-science, #tech, #programming, #learn-programming, #programming-tips, #competitive-coding, #hackernoon-es, and more.


    This story was written by: @rakhmedovrs. Learn more about this writer by checking @rakhmedovrs's about page,
    and for more stories, please visit hackernoon.com.


    The list should be made by splicing together the nodes of the first two lists. It could be singly linked or doubly linked. The number of nodes in both lists is in the range `[0, 50]`-100 <= 100` The first Linked node is usually called the head whereas the last one is called the tail. The solution has a solution and we’ll discuss it in terms of big O notation. We’re looking for a node with minimal value stored in it. We move the pointer to the next for LinkedList which has a head. We also need a current node for storing the link of the current node.

    3 min
  • How to Implement Trie (Prefix Tree) - Blind 75 LeetCode Questions

    This story was originally published on HackerNoon at: https://hackernoon.com/how-to-implement-trie-prefix-tree-blind-75-leetcode-questions.


    A trie (pronounced as “try”) or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings.
    Check more stories related to programming at: https://hackernoon.com/c/programming.
    You can also check exclusive content about #leetcode, #data-structures, #computer-science, #tech, #programming, #learn-programming, #programming-tips, #competitive-coding, #hackernoon-es, and more.


    This story was written by: @rakhmedovrs. Learn more about this writer by checking @rakhmedovrs's about page,
    and for more stories, please visit hackernoon.com.


    Trie is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. There are various applications of this data structure, such as autocomplete and spellchecker. The Trie data structure is the classic data structure that is widely used in text searching. We need to implement Trie with the following method: Trie() and Trie.insert(). In the real example of Trie we had to introduce a small part of the data structure which consists of smaller pieces called **Tree. nodes.

    5 min

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