JavaScript Essentials Quiz

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Test your JavaScript knowledge.

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Michael Jerome Ocampo

Emiratos Árabes Unidos

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JavaScript Essentials Quiz


JavaScript Essentials QuizVersión en línea Test your JavaScript knowledge. por Michael Jerome Ocampo 1 What is the purpose of the 'let' keyword in JavaScript? a Declare a global variable. b Declare a constant. c Declare a function. d Declare a block-scoped variable. 2 What does the === operator do in JavaScript? a Loose equality with type coercion. b Strict equality without type coercion. c Performs a case-insensitive comparison. d Compares by value only. 3 What is a JavaScript closure? a A type of object. b A function and its captured lexical environment. c A function with no parameters. d A global variable. 4 What is the result of typeof null in JavaScript? a null b undefined c object d number 5 What does Array.prototype.map do? a Cuts the array into chunks. b Returns a new array with each element transformed. c Removes elements that don't pass a test. d Sorts the array in place. 6 What is a Promise in JavaScript? a A function that runs in a separate thread. b An object representing an async operation's eventual result. c A collection of DOM nodes. d A type of array. 7 What does an async function do? a Returns a promise and enables await usage. b Converts code to synchronous execution. c Creates a new DOM element. d Immediately executes synchronously. 8 Which method checks if an array contains a specific value? a push() b includes c pop() d slice() 9 What is the difference between let and var? a var is constant. b let is global; var is block-scoped. c let is block-scoped; var is function-scoped. d Both behave identically. 10 What is event delegation in JavaScript? a Disabling all events. b Binding events to every child. c Only works with mouse events. d Handling events on a common ancestor to manage many children. 11 Which of these is a primitive data type? a Function b Array c Object d Number 12 What is the difference between null and undefined? a Null is an assigned empty value; undefined means not assigned. b Undefined means no value assigned. c Null is the same as undefined. d Undefined is a type of number. 13 What is JSON in JavaScript context? a A database query language. b A JavaScript framework. c JavaScript Object Notation; a lightweight data format. d A type of function. 14 What is hoisting in JavaScript? a Declarations are moved to top of scope. b Renames variables automatically. c Executes code earlier. d Only applies to functions. 15 What does the spread operator '...' do in arrays? a Compresses an array. b Sorts the array. c Expands elements into individual items. d Combines numbers with a bitwise OR.

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JavaScript Essentials Quiz

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JavaScript Essentials QuizVersión en línea

por Michael Jerome Ocampo

What is the purpose of the 'let' keyword in JavaScript?

What does the === operator do in JavaScript?

What is a JavaScript closure?

What is the result of typeof null in JavaScript?

What does Array.prototype.map do?

What is a Promise in JavaScript?

What does an async function do?

Which method checks if an array contains a specific value?

What is the difference between let and var?

What is event delegation in JavaScript?

Which of these is a primitive data type?

What is the difference between null and undefined?

What is JSON in JavaScript context?

What is hoisting in JavaScript?

What does the spread operator '...' do in arrays?