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JavaScript Tutorial
BOSS QUIZ
10 questions · 5 minutes · pass at 70% to clear the track.
05:00
Start
Q1.
Which combinator NEVER rejects?
from JS Promises
Promise.all
Promise.race
Promise.allSettled
Promise.any
Q2.
A name declared inside a block with `let` is…
from JS Scope
Visible outside the block
Not visible outside the block
Always global
Hoisted to the top of the file
Q3.
Return an object literal from an arrow with…
from JS Arrow Functions
() => { x: 1 }
() => ({ x: 1 })
() => return { x: 1 }
() => obj { x: 1 }
Q4.
Function declarations are hoisted with…
from JS Hoisting
Just the name (undefined)
The full function — callable above the line
Only in strict mode
Never
Q5.
A setter runs when you…
from Object Get / Set
Read the property
Assign to the property
Stringify the object
Delete the property
Q6.
Math.PI ≈
from JS Math
2.71828
3.14159
1.41421
1.61803
Q7.
Code that should always run (cleanup) goes in…
from JS Errors
try
catch
finally
after
Q8.
ES Modules and class bodies are…
from JS Strict Mode
Always sloppy
Always strict — no opt-in needed
Strict only with the directive
Strict in production builds only
Q9.
In modern code, prefer apply or spread?
from Function apply()
apply — it is faster
spread — clearer and works with constructors
Always apply
It depends on the engine
Q10.
Truly immutable arrays use…
from JS Array Const
const alone
Object.freeze(arr)
TypedArray
[].fixed()
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