Q371. What are various operators supported by javascript?
An operator is capable of manipulating(mathematical and logical computations) a certain value or operand. There are various operators supported by JavaScript as below, 1....
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Q372. How JSX prevents Injection Attacks?
React DOM escapes any values embedded in JSX before rendering them. Thus it ensures that you can never inject anything that’s not explicitly written in your application. ...
Q373. What is a rest parameter?
Rest parameter is an improved way to handle function parameters which allows us to represent an indefinite number of arguments as an array. The syntax would be as below, ...
Q374. How do you update rendered elements?
You can update UI(represented by rendered element) by passing the newly created element to ReactDOM's render method. For example, lets take a ticking clock example, where...
Q375. What happens if you do not use rest parameter as a last argument?
The rest parameter should be the last argument, as its job is to collect all the remaining arguments into an array. For example, if you define a function like below it do...
Q376. How do you say that props are readonly?
When you declare a component as a function or a class, it must never modify its own props. Let us take a below capital function, ```javascript function capital(amount, in...
Q377. What are the bitwise operators available in javascript?
Below are the list of bitwise logical operators used in JavaScript 1. Bitwise AND ( & ) 2. Bitwise OR ( | ) 3. Bitwise XOR ( ^ ) 4. Bitwise NOT ( ~ ) 5. Left Shift ( > ) ...
Q378. What are the conditions to safely use the index as a key?
There are three conditions to make sure, it is safe use the index as a key. 1. The list and items are static– they are not computed and do not change 2. The items in the ...
Q379. What is a spread operator?
Spread operator allows iterables( arrays / objects / strings ) to be expanded into single arguments/elements. Let's take an example to see this behavior, ```javascript fu...
Q380. Should keys be globally unique?
The keys used within arrays should be unique among their siblings but they don’t need to be globally unique. i.e, You can use the same keys with two different arrays. For...