Q431. What is an anonymous function?
An anonymous function is a function without a name! Anonymous functions are commonly assigned to a variable name or used as a callback function. The syntax would be as be...
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Q432. Is Hooks cover all use cases for classes?
Hooks doesn't cover all use cases of classes but there is a plan to add them soon. Currently there are no Hook equivalents to the uncommon **getSnapshotBeforeUpdate** and...
Q433. What is the precedence order between local and global variables?
A local variable takes precedence over a global variable with the same name. Let's see this behavior in an example. ```javascript var msg = "Good morning"; function greet...
Q434. What is the stable release for hooks support?
React includes a stable implementation of React Hooks in 16.8 release for below packages 1. React DOM 2. React DOM Server 3. React Test Renderer 4. React Shallow Renderer
Q435. What are javascript accessors?
ECMAScript 5 introduced javascript object accessors or computed properties through getters and setters. Getters uses the `get` keyword whereas Setters uses the `set` keyw...
Q436. Why do we use array destructuring (square brackets notation) in `useState`?
When we declare a state variable with `useState`, it returns a pair — an array with two items. The first item is the current value, and the second is a function that upda...
Q437. How do you define property on Object constructor?
The `Object.defineProperty()` static method is used to define a new property directly on an object, or modify an existing property on an object, and returns the object. L...
Q438. What are the sources used for introducing hooks?
Hooks got the ideas from several different sources. Below are some of them, 1. Previous experiments with functional APIs in the react-future repository 2. Community exper...
Q439. What is the difference between get and defineProperty?
Both have similar results unless you use classes. If you use `get` the property will be defined on the prototype of the object whereas using `Object.defineProperty()` the...
Q440. How do you access imperative API of web components?
Web Components often expose an imperative API to implement its functions. You will need to use a **ref** to interact with the DOM node directly if you want to access impe...