Q951. Benefits
- Avoids deep inheritance hierarchies - Encourages composition over inheritance - Promotes reusable and modular code Modern JavaScript favors mixin alternatives like comp...
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Q952. What is a thunk function?
A thunk is just a function which delays the evaluation of the value. It doesn’t take any arguments but gives the value whenever you invoke the thunk. i.e, It is used not ...
Q953. Why should we not update the state directly?
If you try to update the state directly then it won't re-render the component. ```javascript //Wrong this.state.message = "Hello world"; ``` Instead use `setState()` meth...
Q954. What is the purpose of callback function as an argument of `setState()`?
The callback function provided as the second argument to `setState` is executed after the state has been updated and the component has re-rendered. Because `setState()` i...
Q955. What is the output of below function calls?
**Code snippet:** ```javascript const circle = { radius: 20, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this?.radius, }; ``` ```javascript con...
Q956. How to bind methods or event handlers in JSX callbacks?
There are 3 possible ways to achieve this in class components: 1. **Binding in Constructor:** In JavaScript classes, the methods are not bound by default. The same rule a...
Q957. How to remove all line breaks from a string?
The easiest approach is using regular expressions to detect and replace newlines in the string. In this case, we use replace function along with string to replace with, w...
Q958. How to pass a parameter to an event handler or callback?
You can use an _arrow function_ to wrap around an _event handler_ and pass parameters: ```jsx harmony this.handleClick(id)} /> ``` This is an equivalent to calling `.bind...
Q959. What is the difference between reflow and repaint?
A _repaint_ occurs when changes are made which affect the visibility of an element, but not its layout. Examples of this include outline, visibility, or background color....
Q960. What is the use of refs?
The _ref_ is used to return a reference to the element. They _should be avoided_ in most cases, however, they can be useful when you need a direct access to the DOM eleme...