Q691. What is the difference between dense and sparse arrays?
An array contains items at each index starting from first(0) to last(array.length - 1) is called as Dense array. Whereas if at least one item is missing at any index, the...
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Q692. What are the different ways to create sparse arrays?
There are 4 different ways to create sparse arrays in JavaScript 1. **Array literal:** Omit a value when using the array literal ```js const justiceLeague = ["Superman", ...
Q693. What is the difference between setTimeout, setImmediate and process.nextTick?
1. **Set Timeout:** setTimeout() is to schedule execution of a one-time callback after delay milliseconds. 2. **Set Immediate:** The setImmediate function is used to exec...
Q694. How do you reverse an array without modifying original array?
The `reverse()` method reverses the order of the elements in an array but it mutates the original array. Let's take a simple example to demonistrate this case, ```javascr...
Q695. How do you create custom HTML element?
The creation of custom HTML elements involves two main steps, 1. **Define your custom HTML element:** First you need to define some custom class by extending HTMLElement ...
Q696. What is global execution context?
The global execution context is the default or first execution context that is created by the JavaScript engine before any code is executed(i.e, when the file first loads...
Q697. What is function execution context?
Whenever a function is invoked, the JavaScript engine creates a different type of Execution Context known as a Function Execution Context (FEC) within the Global Executio...
Q698. Is it possible to use react without JSX?
Yes, JSX is not mandatory for using React. Actually it is convenient when you don’t want to set up compilation in your build environment. Each JSX element is just syntact...
Q699. What is debouncing?
Debouncing is a programming technique used to limit how often a function is executed. Specifically, it ensures that a function is only triggered after a certain amount of...
Q700. What is throttling?
Throttling is a programming technique used to control the rate at which a function is executed. When an event is triggered continuously—such as during window resizing, sc...