easy== vs equals
What is the result?
let arr = ["a", "b", "c"];
arr.reverse();
console.log(arr);why this works
Built for JavaScript mastery, not memorisation.
Every question is hand-checked, every answer comes with an explanation, and your progress builds into a clear picture of where you stand.
The snippet is on the page
Every JavaScript question shows its code before you answer, so you are reading real JavaScript, not a description of it.
A written explanation, always
Once you attempt a question you get the reasoning, not just a tick. That matters most on JavaScript, where interviewers lean on coercion rules, the prototype chain, closures over loop variables, and the exact order the microtask queue drains.
Your weak topics, named
Progress is tracked per topic across the 42 JavaScript topics, so revision points at the gaps instead of the whole list.
faq
Things people ask.
How many JavaScript MCQs are on Journey Uncommon?
580 JavaScript questions right now: 110 easy, 221 medium and 249 hard. That number is read straight from the question table when this page is built, so it is never a rounded marketing figure.
Do I need an account to read the JavaScript questions?
No. Every JavaScript question, including its code snippet, its difficulty and its topic, is readable without signing in. You need a free account only to submit an answer, see which option is correct, and read the worked explanation. We keep it that way so the platform stays honest about what you actually got right.
What do JavaScript interviewers actually test?
Interviewers lean on coercion rules, the prototype chain, closures over loop variables, and the exact order the microtask queue drains. Most JavaScript screens are really output-prediction screens.
Which JavaScript topics are covered?
42 distinct topics are tagged on the JavaScript questions, including array map filter reduce, primitives and typeof, ToPrimitive coercion algorithm, let const var and scope, template literals, Promise.all race allSettled. The topic labels come from the questions themselves, so the list matches what you will actually be asked.
Is JavaScript practice free?
Yes. Reading is free and unlimited. A free account unlocks answering, explanations and progress tracking. Pro (₹199 per month) adds AI explanations and AI-graded guesstimates on top; it is not needed to practise JavaScript MCQs.
Where is JavaScript used in real jobs?
Frontend roles at almost every company, plus full-stack and Node back-end roles. It is the most common first round in web hiring.
What a JavaScript question here actually looks like
These are 12 of the 580 JavaScript questions in the library, pulled live from the question table. The snippet, the difficulty and the topic are all here. The answer options and the explanation are not. Those need a free account.
Interviewers lean on coercion rules, the prototype chain, closures over loop variables, and the exact order the microtask queue drains. Most JavaScript screens are really output-prediction screens.
Sample JavaScript MCQs
easyarray map filter reduce
What will this print?
let arr = ["a", "b"];
arr.push("c");
console.log(arr);easyprimitives and typeof
What does the following code return?
typeof null === "object"easyarray map filter reduce
What is the output?
let arr = [[1, 2], [3, 4, 5]];
console.log(arr.flat());easythis in callbacks vs methods
What will this code output?
const obj = {
name: "Hello",
sayHello: function() {
console.log(this.name);
}
};
obj.sayHello();easytemplate literals
What is the output?
let str = "Hello World";
console.log(str.toUpperCase());easyarray map filter reduce
What is the output?
let numbers = [1, 2, 3, 4];
let result = numbers.find(n => n > 1);
console.log(result);easyarray map filter reduce
What does the following code output?
let fruits = ["apple", "banana", "orange"];
console.log(fruits.indexOf("banana"));easy== vs equals
What is the result?
let add = (x, y) => x + y;
console.log(add(5, 10));easyarray map filter reduce
What is the output?
let numbers = [1, 2, 3, 4];
let sum = numbers.reduce((acc, val) => acc + val);
console.log(sum);easyarray map filter reduce
What will this code log?
let arr = [[1, 2], [3, 4, 5]];
console.log(arr.flatMap(x => x));easyarray map filter reduce
What is the output?
let arr = [1, 2, 3];
let result = arr.map(x => x + 1);
console.log(result);Sign in to answer
Everything above is free to read. Answering needs a free account.
We keep the correct answer, the explanation and the scoring behind sign-in so the platform stays honest, which is why the correct option and the worked explanation for every JavaScript question stay behind a free account. Signing in is free and takes a few seconds.
Where JavaScript shows up
Frontend roles at almost every company, plus full-stack and Node back-end roles. It is the most common first round in web hiring.