Q721. What is the difference between uneval and eval?
The `uneval` function returns the source of a given object; whereas the `eval` function does the opposite, by evaluating that source code in a different memory area. Let'...
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Q722. 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...
Q723. 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...
Q724. 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...
Q725. 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...
Q726. 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...
Q727. 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...
Q728. 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...
Q729. What are the advantages of Getters and Setters?
Below are the list of benefits of Getters and Setters, 1. They provide simpler syntax 2. They are used for defining computed properties, or accessors in JS. 3. Useful to ...
Q730. What is formik?
Formik is a small react form library that helps you with the three major problems, 1. Getting values in and out of form state 2. Validation and error messages 3. Handling...