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JavaScript Tutorial
BOSS QUIZ
10 questions · 5 minutes · pass at 70% to clear the track.
05:00
Start
Q1.
Sum an array with…
from JS Arrays
arr.sum()
arr.reduce((t, n) => t + n, 0)
arr.total()
+arr
Q2.
Sensitive APIs (camera, geolocation, notifications)…
from Web API Intro
Work without consent
Require user permission
Only run in a worker
Are deprecated
Q3.
sessionStorage clears…
from Web Storage API
Never
When the tab closes
After 1 hour
On every refresh
Q4.
Best test for an array is…
from JS Typeof
typeof x === "array"
Array.isArray(x)
x instanceof Array
Both B and C
Q5.
Render an object usefully with…
from Object Display
String(obj)
JSON.stringify(obj, null, 2)
obj.valueOf()
obj.toLocaleString()
Q6.
Use a computed key with…
from Object Definitions
{ "key": value }
{ [keyVar]: value }
{ key.value }
{ $key: value }
Q7.
A good first JS challenge is…
from JS Challenges
Implementing a database
A click counter
Compiling LLVM
Building a kernel
Q8.
Batch-insert many nodes efficiently with…
from DOM Nodes
document.write
DocumentFragment
innerHTML +=
A loop calling append
Q9.
Read every field of a form quickly with…
from Web Forms API
Object.fromEntries(new FormData(form))
form.toJSON()
serialize(form)
JSON.parse(form.outerHTML)
Q10.
A good fit for a getter is…
from Object Get / Set
A derived value from other fields
Something async
Anything expensive
A property that triggers a network request
Submit
Back to JavaScript Tutorial
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