Q851. Is that possible to use expressions in switch cases?
You might have seen expressions used in switch condition but it is also possible to use for switch cases by assigning true value for the switch condition. Let's see the w...
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Q852. How do you say that state updates are merged?
When you call setState() in the component, React merges the object you provide into the current state. For example, let us take a facebook user with posts and comments de...
Q853. What is the easiest way to ignore promise errors?
The easiest and safest way to ignore promise errors is void that error. This approach is ESLint friendly too. ```js await promise.catch((e) => void e); ```
Q854. How do you pass arguments to an event handler?
During iterations or loops, it is common to pass an extra parameter to an event handler. This can be achieved through arrow functions or bind method. Let us take an examp...
Q855. How do style the console output using CSS?
You can add CSS styling to the console output using the CSS format content specifier %c. The console string message can be appended after the specifier and CSS style in a...
Q856. How to prevent component from rendering?
You can prevent component from rendering by returning null based on specific condition. This way it can conditionally render component. ```javascript function Greeting(pr...
Q857. What is nullish coalescing operator (??)?
It is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand. ...
Q858. Give an example on How to use context?
**Context** is designed to share data that can be considered **global** for a tree of React components. For example, in the code below lets manually thread through a “the...
Q859. How do you group and nest console output?
The `console.group()` can be used to group related log messages to be able to easily read the logs and use console.groupEnd()to close the group. Along with this, you can ...
Q860. How do you use contextType?
ContextType is used to consume the context object. The contextType property can be used in two ways, 1. **contextType as property of class:** The contextType property on ...