Cigniti Technologies Lead Interview Questions, Process, and Tips

Closure is the process of finalizing or resolving something, often involving emotional healing or acceptance.

• Closure is the act of coming to terms with a situation or relationship that has ended.

• It involves accepting the reality of the situation and moving forward.

• Closure can help individuals find peace and emotional healing after a difficult experience.

• Examples of closure include talking things out with a friend after...read more

let, var and const are all used to declare variables in JavaScript, but they have different scopes and mutability.

• let is block-scoped and can be reassigned, var is function-scoped and can be reassigned, const is block-scoped and cannot be reassigned

• Using let:

• let x = 10;

• x = 20; // valid

• Using var:

• var y = 5;

• y = 10; // valid

• Using const:

• const z = 15;

• z = 25; // error, cannot reassign a const variable

Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking and processing events.

• Event loop is commonly used in JavaScript to handle asynchronous operations.

• It allows for non-blocking I/O operations by delegating tasks to the operating system.

• Event loop processes events from the event queue and executes associated callback functions.

• Example: setTimeout() function in...read more

Callback hell arises from nested callbacks in asynchronous JavaScript code, leading to unreadable and difficult-to-maintain code.

• Nested callbacks in asynchronous code can lead to deeply nested code structures, making it hard to follow the flow of the program.

• Error handling becomes more complex in callback hell, as errors need to be propagated through multiple levels of callbacks.

• Callback hell can also result in code th...read more