Express test JavaScript: Middle level

Description

Check your abilities and showcase the expertise in JavaScript coding with our platform, join us to 
take the JavaScript knowledge to the next level!

Questions

20

Time to complete

23 min

javascript

Skills

Implicit Type Casting
nullish coalescing
ESM
async/await
Event Loop
Algorithms
Object Prototype
ES2022
Patterns
Arrays
Memory Lifecycle
Closures
setTimeout
Prototypal Inheritance
Destructuring assignment
Object
Built-in Objects
IIFEs
bind
Arrow Functions
Classes
Type Conversion vs Coercion
Explicit Type Casting
var
let
===
Block
HTML: Events
Default Params
CORS
Symbol
Symbol.iterator
for...of loop
Unary Operators
Assignment Operators
Logical Operators
Map
Lexical Scoping
spread
Iterators and Generators
Set
Garbage Collection
Code examples
decorators
in a function
try/catch/finally
Built-in Functions
call
import()
Rest
Function
const
break / continue
for
for...in loop
performance optimization
Regular expressions
Weak Map
Loops and Iterations
Hoisting
Weak Set
while
do...while
Recursion
Fetch
Symbol.dispose
Strict Mode
DOM APIs
Global
Typed Arrays
JSON
Object.is
isLooselyEqual
SameValueZero
SameValue
if...else
Switch
Error Objects
Arithmetic Operators
Bitwise Operators
BigInt Operators
String Operators
Conditional Operators
Comma Operators
arguments object
Function Borrowing
in a method
in arrow functions
in event handlers
apply
Callback Hell
setInterval
XMLHTTPRequest
CommonJS
Debugging Issues
Debugging Memory Leaks
Debugging Performance

Personalize skills

Challenge mode

If you take the test with the challenge mode off, the test will not be time-limited. However, you will lose the opportunity to earn points in the competition

Free access to the test according to the competition “Hello world”