Apr 2Closure in javascriptClosure is a concept in JavaScript where inner functions have access to the properties and methods of outer functions even after the execution of the external function is done. function example() { let name = "john"; function displayName() { console.log(name); } displayName(); } example(); // "john" If you notice the…JavaScript1 min readJavaScript1 min read
Dec 18, 2022Repaints And ReflowsRepaints occur when changes are made to an element’s visual properties, such as its color or font size. These changes can be triggered by a variety of events, such as hovering over an element with the mouse or changing the window size. …Web Development2 min readWeb Development2 min read
Nov 21, 2022Array.prototype.mapArray.prototype.map Array.prototype.map returns a new array containing the results of calling a given function on every element of the calling array. callbackFn: A function to execute for each element in the array. Its return value is added as a single element in the new array. Pollyfill for map /** * @callback…JavaScript1 min readJavaScript1 min read
Mar 6, 2021Debouncing & Throttling in JavaScriptThe throttle is very similar to debounce, they both avoid the unnecessary actions to be fired. Imagine if you have a button and if we click it multiple times in quick succession then the event associated with that event would get fired multiple times and we want to avoid that. …JavaScript2 min readJavaScript2 min read
Jan 22, 2021The Rest and Spread operator in javaScriptBoth rest and spread operators have similar syntax i.e 3 dots (…) The spread operator is used to create copies of array/objects. The rest operator is used to collect all the remaining values.JavaScript1 min readJavaScript1 min read
Jan 17, 2021Prototype in JavaScriptThe prototype is an object that is associated with every function and object by default in JavaScript, where the function’s prototype property is accessible and modifiable and the object’s prototype property is not visible. Each object has a private property that holds a link to another object called its prototype…JavaScript2 min readJavaScript2 min read
Jan 10, 2021Polyfill in JavaScriptA polyfill is a browser fallback, made in JavaScript, that allows functionality you expect to work in modern browsers to work in older browsers, e.g., to support canvas (an HTML5 feature) in older browsers. A polyfill is a piece of code that provides the methods that the developers, expect the…JavaScript1 min readJavaScript1 min read
Jan 9, 2021Async V/S Defer attributes in javascriptAsync and defer are boolean attributes that are used along with the script tag to load the external scripts efficiently into our webpage. Normal Script: Suppose the browser is loading a webpage and parsing the HTML line by line and suddenly encountering a script tag then what happens is the…JavaScript1 min readJavaScript1 min read
Published inThe Startup·Jan 9, 2021Currying in JavaScriptCurrying is a process in functional programming in which we can transform a function with multiple arguments into a sequence of nesting functions. In other words, it restructures a function so it takes one argument then returns another function that takes the next argument, and so on. We will learn…JavaScript2 min readJavaScript2 min read
Jan 8, 2021How JavaScript code is executed?When we run the code a global execution context is created. Execution context is created in two phases i.e. memory creation phase and code execution phase. Let’s understand this with the help of a program. var x = 10; function square(num) { var ans = num * num; return ans…JavaScript1 min readJavaScript1 min read
