10+ Csat System Interview Questions and Answers

Javascript is single-threaded.

• Javascript runs on a single thread called the event loop.

• This means that it can only execute one task at a time.

• However, it can delegate tasks to other threads using web workers.

• This allows for parallel processing without blocking the main thread.

Position relative is relative to its normal position, while position absolute is relative to its nearest positioned ancestor.

• Position relative moves an element relative to its normal position.

• Position absolute moves an element relative to its nearest positioned ancestor.

• Position absolute elements are taken out of the normal flow of the document.

The typeof() method in JavaScript returns the data type of a variable or expression.

• typeof() returns a string indicating the type of the operand.

• It can be used with variables, literals, or expressions.

• Common return values include 'number', 'string', 'boolean', 'object', 'function', and 'undefined'.

z index determines the stacking order of elements on a webpage.

• z index is a CSS property that specifies the stack order of an element

• Elements with a higher z index value will be displayed on top of elements with a lower value

• Default z index value is 0, negative values are allowed

• z index only works on positioned elements (position: relative, absolute, fixed)

Async/await is a syntax for writing asynchronous code in a synchronous way.

• Async/await is built on top of Promises.

• Async functions always return a Promise.

• Await can only be used inside an async function.

• Async/await makes code easier to read and write compared to using callbacks or Promises.