Q1061. What are the different kinds of generators?
There are five kinds of generators, 1. **Generator function declaration:** ```javascript function* myGenFunc() { yield 1; yield 2; yield 3; } const genObj = myGenFunc(); ...
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Q1062. What is the methods order when component re-rendered?
An update can be caused by changes to props or state. The below methods are called in the following order when a component is being re-rendered. 1. static getDerivedState...
Q1063. What are the built-in iterables?
Below are the list of built-in iterables in javascript, 1. Arrays and TypedArrays 2. Strings: Iterate over each character or Unicode code-points 3. Maps: iterate over its...
Q1064. What are the methods invoked during error handling?
Below methods are called when there is an error during rendering, in a lifecycle method, or in the constructor of any child component. 1. static getDerivedStateFromError(...
Q1065. What are the differences between for...of and for...in statements?
Both for...in and for...of statements iterate over js data structures. The only difference is over what they iterate: 1. for..in iterates over all enumerable property key...
Q1066. What is the purpose of unmountComponentAtNode method?
This method is available from react-dom package and it removes a mounted React component from the DOM and clean up its event handlers and state. If no component was mount...
Q1067. How do you define instance and non-instance properties?
The Instance properties must be defined inside of class methods. For example, name and age properties defined inside constructor as below, ```javascript class Person { co...
Q1068. What are the limitations with HOCs?
Higher-order components come with a few caveats apart from its benefits. Below are the few listed in an order, 1. **Don’t use HOCs inside the render method:** It is not r...
Q1069. What is the difference between isNaN and Number.isNaN?
1. **isNaN**: The global function `isNaN` converts the argument to a Number and returns true if the resulting value is NaN. 2. **Number.isNaN**: This method does not conv...
Q1070. How to invoke an IIFE without any extra brackets?
Immediately Invoked Function Expressions(IIFE) requires a pair of parenthesis to wrap the function which contains set of statements. ```js (function (dt) { console.log(dt...