Jio Platforms Front end Developer Interview Questions, Process, and Tips

Machine code test related to javascript and mcq questions from output based

Q1. Write code for promise and explain. Write html form from scratch for js. Coding questions related to array
Ans. 
Answering coding questions related to promises, HTML forms, and arrays.
• To create a promise in JavaScript, use the Promise constructor and pass in a function with resolve and reject parameters.

• Example: const myPromise = new Promise((resolve, reject) => { // code here });

• To create an HTML form in JavaScript, use the document.createElement method to create form, input, and button elements.

• Example: const form = document...read more
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Q2. Write code for promise
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A promise is an object representing the eventual completion or failure of an asynchronous operation.
• Create a new promise using the Promise constructor

• Use the resolve and reject functions to handle the success or failure of the asynchronous operation

• Chain .then() and .catch() methods to handle the resolved or rejected promises respectively
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Q3. Write react component code for use memo use callback
Ans. 
React component code using useMemo and useCallback
• Use useMemo to memoize a value and useCallback to memoize a function

• Example: const memoizedValue = useMemo(() => computeExpensiveValue(a, b), [a, b]);

• Example: const memoizedCallback = useCallback(() => { doSomething(a, b); }, [a, b]);
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Q4. Create own filter method
Ans. 
Custom implementation of filter method for arrays
• Create a function that takes an array and a callback function as parameters

• Iterate through the array and apply the callback function to each element

• If the callback function returns true for an element, add it to a new array
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Q5. Create pagination work flow
Ans. 
Pagination work flow involves dividing content into pages for easier navigation.
• Determine total number of items to be paginated

• Calculate total number of pages based on items per page

• Display page numbers for navigation

• Allow users to navigate to previous and next pages

• Update content based on selected page number
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Q1. What is closure, Polly fill for reduce, guess the output questions, some programs based on strings
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