Rahul Blogs

  Ever been haunted by the question, “Why does JavaScript have functions that seem to take  forever  to get all their arguments?” Welcome to the fascinating world of  currying ! If you’ve ever come across code with functions inside functions, that’s probably currying at work — a game-changing technique in functional programming. Let’s dive into what currying is, why it’s powerful, and where it can be used practically. What is Currying? Currying is a technique in functional programming that transforms a function with multiple arguments into a series of functions, each taking just one argument. Rather than passing all arguments at once, you provide them one at a time, allowing each function in the series to return another function that takes the next argument. Once all arguments are provided, the final function in the chain returns the result. For instance, instead of writing: function area ( length, breadth ) { return length * breadth; } console . log ( area ( 2...

  Ever wondered why some functions in JavaScript seem to have a memory of where they came from? Closures in JavaScript are exactly that - a function bundled with its surrounding state or lexical environment. Closures might sound complex, but with a few real-world analogies and a dash of humor, you’ll be using them like a pro in no time! What Exactly Is a Closure? 🤔 In Javascript, a closure is formed when a function is bundled together with its lexical environment - think of it as the memory of the function. When a function is created inside another function, it has access not only to its own variables but also to those in the outer function where it was created. The inner function “remembers” this context, even if it’s called somewhere else later on. Let’s break down this code: function x () { var a = 7 ; function y () { console . log (a); } return y; } var z = x (); console . log (z); // Output: [Function: y] z (); // Output: 7 When we call  x() , it returns...