Q321. What is module pattern?
Module pattern is a designed pattern used to wrap a set of variables and functions together in a single scope returned as an object. JavaScript doesn't have access specif...
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Q322. What are the uses of closures?
Closures are a powerful feature in programming languages like JavaScript. They allow functions to retain access to variables from their containing (enclosing) scope even ...
Q323. What are the examples of built-in higher order functions?
There are several built-in higher order functions exists on arrays, strings, DOM and promise methods in javascript. These higher order functions provides significant leve...
Q324. What are the benefits higher order functions?
A **Higher-Order Function (HOF)** in JavaScript is a function that either accepts one or more functions as arguments, or returns a function as its result (leveraging firs...
Q325. What is the difference between map and forEach functions?
Both map and forEach functions are used to iterate over an arrays but there are some differences in their functionality. 1. **Returning values:** The `map` method returns...
Q326. What is module scope in JavaScript?
Module scope is a feature introduced with ES6 (ES2015) modules that creates a scope specific to a module file, isolating variables and functions declared within it from t...
Q327. What is top-level await in JavaScript modules?
Top-level await is a feature (introduced in ES2022) that allows you to use the `await` keyword at the top level of ES modules, outside of async functions. This enables mo...
Q328. What are generator functions and how do they work?
Generator functions are special functions that can pause execution and resume later, allowing them to produce a sequence of values over time instead of computing them all...
Q329. What is tail call optimization and does JavaScript support it?
Tail call optimization (TCO) is a technique where a function call in tail position (the last operation before returning) reuses the current stack frame instead of creatin...