5 Commonly Asked Interview Questions for JavaScript Developers: #interviewquestions #shorts #career

Here are brief answers to the questions provided:

1. What is closure in JavaScript?
Answer - Closure refers to the combination of a function and the lexical environment within which that function was declared. It allows a function to retain access to variables from its containing scope even after the parent function has finished executing.

2. Explain event bubbling and event capturing in JavaScript.
Answer - Event bubbling is the propagation of an event from the target element up to the root of the DOM tree, while event capturing is the opposite: the event is captured from the root down to the target element. This behavior allows multiple event handlers to be triggered in a specific order.

3. What is the difference between '==' and '===' operators in JavaScript?
Answer - The '==' operator performs type coercion before comparison, attempting to convert operands to the same type, while '===' is a strict equality comparison, which checks both value and type without coercion. '===' is generally considered safer and more predictable.

4. How does asynchronous programming work in JavaScript?
Answer - Asynchronous programming in JavaScript allows tasks to be executed concurrently without blocking the main thread. This is achieved using mechanisms such as callbacks, Promises, async/await, and the event loop, which handles non-blocking I/O operations efficiently.

5. What is the difference between 'let', 'const', and 'var' in JavaScript?
Answer - 'var' declares variables with function or global scope and allows redeclaration and reassignment. 'let' and 'const' were introduced in ES6, where 'let' allows block-scoped variables with reassignment, while 'const' declares constants with block scope, whose value cannot be re-assigned.

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