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master In this article, we’ll dive into one of JavaScript’s core concepts: the prototype chain. If you’ve ever wondered how JavaScript handles inheritance without traditional classes (like in Java or C++), this post is for you! Introduction Unlike Java or C++, which use class-based object-oriented programming, JavaScript follows a prototype-based model. Even though JavaScript now has … Read more
Introduction JavaScript provides various built-in functions to simplify coding tasks. Some of these functions are highly useful, while others require careful use due to security concerns. Let’s explore them in detail! eval() – Execute a String as Code The eval() function interprets a string as JavaScript code and executes it. Example ⚠️ Why You Should … Read more
Introduction JavaScript operators work slightly differently from those in Java or C, which can sometimes be confusing. Even though they seem simple, it’s beneficial to understand them properly to avoid unexpected results. + Operator (Addition & String Concatenation) The + operator performs addition when both operands are numbers and string concatenation when at least one … Read more
Question #1 A global enterprise is building a new data analytics platform that relies on high-performance computing (HPC). The architecture must support POSIX-compliant storage with redundancy across multiple Availability Zones and concurrent access from thousands of EC2 instances. Which AWS storage service best fits these requirements? A. Amazon ElastiCacheB. Amazon Elastic File SystemC. Amazon S3D. Amazon … Read more
Question #1 A company plans to host a movie streaming app in AWS. The chief information officer (CIO) wants to ensure that the application is highly available and scalable. The application is deployed to an Auto Scaling group of EC2 instances on multiple Availability Zones (AZs). A load balancer must be configured to distribute incoming requests … Read more
Arrays in JavaScript are versatile and essential for managing collections of data. Unlike statically typed languages such as Java or C, JavaScript arrays are dynamic and can hold multiple types of values within a single array. 1. Creating Arrays JavaScript provides multiple ways to create arrays. 1.1 Using Array Literals The simplest way to create … Read more
JavaScript is a loosely typed language, meaning variables do not require explicit type declarations like in languages such as Java or C. Instead, the data type of a variable is determined dynamically based on the assigned value. JavaScript data types can be broadly categorized into two types: Let’s explore these categories in detail. 1. Primitive … Read more
1. Functions in JavaScript Are Objects In JavaScript, functions are not just blocks of reusable code; they are also objects. This means that a function can have properties and methods just like any other object. Example: 2. Functions Are First-Class Citizens Functions in JavaScript are treated as first-class objects, which means they can: 2.1 Assigning … Read more
When writing JavaScript, it is common practice to omit semicolons (;) at the end of function statements but to include them in function expressions. This helps avoid potential issues caused by JavaScript’s automatic semicolon insertion (ASI). Function Statement (Declaration) A function statement defines a named function that can be used before its declaration due to … Read more
1. Function Literals In JavaScript, functions are treated as first-class objects, meaning they can be assigned to variables, passed as arguments, and returned from other functions. Just like object literals, JavaScript allows the creation of function literals. Example: Key Features: 2. Function Declaration A function can be defined using the function declaration syntax. Unlike function … Read more