If you place a tag in the without any defer or async attribute, what will happen?

The script blocks HTML parsing until it finishes running

The script runs after the page loads completely

The script runs asynchronously with the page

Whatʼs wrong with this variable declaration? let 2beOrNot2be = true;

Variable names cannot start with a number

You must use var for boolean variables

Why do JavaScript devs prefer let over var?

Because let actually scopes variables properly — no surprises!

Because var sounds like “very old”

Because let makes them feel less scoped out

Because the coffee machine runs on let

Which of the following is true about JavaScript variables declared with let?

They are block-scoped and cannot be re-declared in the same block

They can be re-declared in the same block

They have global scope regardless of where declared

They behave exactly like var variables

Which of these is true about functions created with function keyword vs arrow functions?

Arrow functions inherit this from their defining scope

Arrow functions have their own this context

Functions and arrow functions behave exactly same

You canʼt use return in arrow functions

If JavaScript was a magician, which trick would it do best?

Converting "5" + 1 into "51" without blinking

Typing disappearing act with undefined

Making variables disappear with var

Given the code snippet: const PI = 3.14; PI = 3.1415; What will happen?

Error: Assignment to constant variable

The value of PI changes to 3.1415

The code runs without errors but PI value remains 3.14

What happens to the variables declared with var inside a block?

They function scoped, not block scoped

What do you get if you cross an HTML button with a JS event?

An interactive friend who never forgets to listen!

A button that cries when clicked

A magic trigger for your websiteʼs mood swings

What did the JS developer say when asked about semicolons?

“Theyʼre optional, but I like living dangerously.”

“Semicolons? Never heard of them!”

“Semicolons are my best friends.”

“Iʼm in an unresolved relationship with semicolons.”

Why are structure members always calm?

Because they each have their own space to chill

They donʼt share memory, so no conflicts

Hackharbor 3.0 Day 4:Tech

Authored by Vivek N

Engineering

University

Used 6+ times

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20 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement below accurately describes JavaScriptʼs typing system?

JavaScript requires explicit data type declaration for every variable

JavaScript is statically typed like C

JavaScript is dynamically typed and infers the data type at runtime

JavaScript cannot change a variableʼs type once assigned

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Whatʼs the difference between null and undefined in JavaScript?

Both mean the same: variable has no value

null means variable is declared but empty, undefined means variable does not exist

undefined means variable is declared but not assigned; null is an assigned “empty” value

None, they are interchangeable

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What will happen if you omit semicolons at the end of statements in JavaScript?

JavaScript inserts them automatically in most cases

The script will never run

It causes syntax errors every time

The browser ignores the whole script

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which one of these is the recommended way to attach multiple event listeners to the same button?

Use multiple onclick attributes on button element

Use inline onclick plus .addEventListener()

Use .addEventListener() multiple times on the button element

Overwrite the buttonʼs .onclick property multiple times

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why did JavaScript go to therapy?

Because it had too many types of issues: null, undefined, and mixed feelings about == vs ===!

To learn Python

Because it couldnʼt decide if it wanted to be static or dynamic

It wanted a break from browsers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt