SOLID / DRY principles

-
In software development, Object-Oriented Design plays a crucial role when it comes to writing flexible, scalable, maintainable, and reusable code. There are so many benefits of using OOD but every developer should also have the knowledge of the SOLID principle for good object-oriented design in programming. The SOLID principles are designed to help developers design robust, maintainable applications. The five SOLID principles are: Single-responsibility principle - Function and classes should have one job. Open–closed principle - Classes and functions should be open for  extension but not for modification. Liskov substitution principle - Child class can replace parent class Interface segregation principle - This principle is the first principle that applies to Interfaces instead of classes in SOLID and it is similar to the single responsibility principle. It states that “do not force any client to implement an interface which is irrelevant to them“. Here your main goal is ...
Post a Comment

What is the Temporal Dead Zone

-

 The Temporal Dead Zone is a behavior in JavaScript that occurs when declaring a variable with the let and const keywords, but not with var. In ECMAScript 6, accessing a let or const variable before its declaration (within its scope) causes a ReferenceError. The time span when that happens, between the creation of a variable’s binding and its declaration, is called the temporal dead zone.

Let's see this behavior with an example,

function somemethod() {
  console.log(counter1); // undefined
  console.log(counter2); // ReferenceError
  var counter1 = 1;
  let counter2 = 2;
}

Comments

Post a Comment

Popular posts from this blog

Difference between localStorage and sessionStorage

-
Both `localStorage` and `sessionStorage` are web storage options provided by modern web browsers to store data on the client-side. They have some similarities but also important differences in terms of data persistence and scope. Here's a breakdown of the key differences: 1. Data Persistence:    - `localStorage`: The data stored in `localStorage` persists even after the browser window is closed and reopened. It remains available until explicitly cleared or removed.    - `sessionStorage`: The data stored in `sessionStorage` persists only for the duration of the current browser session. When the browser window or tab is closed, the data is cleared and no longer accessible. 2. Scope:    - `localStorage`: The data stored in `localStorage` is accessible across multiple windows or tabs of the same origin. This means that data set in one window/tab can be accessed in another window/tab of the same origin.    - `sessionStorage`: The data stored in `sessio...
Read more

Scope in javascript

-
In JavaScript, scope refers to the visibility and accessibility of variables, functions, and objects in a particular part of your code. It determines where and how variables can be accessed and modified. There are two main types of scope in JavaScript: global scope and local scope. 1. Global Scope:    - Variables declared outside of any function have global scope.    - Global variables can be accessed from anywhere in your code, including inside functions.    - Example:    var globalVariable = "I'm a global variable";    function printGlobal() {      console.log(globalVariable);    }    printGlobal(); // Output: I'm a global variable 2. Local Scope:    - Variables declared within a function have local scope, meaning they are only accessible within that function (including any nested functions).    - Local variables take precedence over global variables with the same name.   ...
Read more

What is memoization

-
Memoization is a technique used in JavaScript (and other programming languages) to optimize the performance of functions by caching the results of expensive function calls. It involves storing the computed values of function calls and returning the cached result when the same inputs are provided again. The idea behind memoization is that if a function is called with the same arguments multiple times, instead of recomputing the result every time, the function can return the previously computed result from a cache. This can significantly improve the execution time, especially for functions that involve complex or time-consuming computations. Here's an example of a memoized function in JavaScript: function memoizedFunction(n) {   if (memoizedFunction.cache[n] !== undefined) {     console.log("Fetching from cache");     return memoizedFunction.cache[n];   } else {     console.log("Computing result");     const result = n * 2;     m...
Read more