Pragmatix Research & Advisory Services Interview Questions and Answers

display: None removes the element from the flow of the document, while visibility: 0 hides the element but still takes up space.

• display: None removes the element from the document flow, making it invisible and not taking up any space.

• visibility: 0 hides the element visually, but it still occupies space in the layout.

• display: None is commonly used to hide elements completely, while visibility: 0 is used to hide elements while preserving the layout.

Sorting an array without using built-in JS methods

• Create a custom sorting function using a sorting algorithm like bubble sort, selection sort, or insertion sort

• Compare each element in the array and swap them if they are in the wrong order

• Repeat the process until the array is fully sorted

A promise is an object representing the eventual completion or failure of an asynchronous operation.

• Promises are used to handle asynchronous operations in JavaScript.

• They help in avoiding callback hell and writing cleaner code.

• Promises have states - pending, fulfilled, or rejected.

• They can be chained using .then() method.

• Example: Fetching data from an API returns a promise that resolves with the data.

Hoisting is a behavior in JavaScript where variable and function declarations are moved to the top of their containing scope during the compilation phase.

• Variable declarations are hoisted to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.

splice is used to add or remove elements from an array, while slice is used to extract a portion of an array without modifying it.

• splice modifies the original array by adding or removing elements, while slice does not modify the original array

• splice returns the removed elements as a new array, while slice returns the extracted elements as a new array

• splice takes in parameters for index, number of elements to remove, and optional elements to add, while slice takes in parameter...read more