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| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Modules and decorators - Execution flow and context - Arrow functions - Variable scope and closures - ES6 classes and inheritance - Prototypal inheritance - Object creation and manipulation - Higher-order functions - Function declarations and expressions |
| Variables, Types, and Collections | 23% | - Arrays and collections - Variable declarations and initialization - Strings, numbers, and dates - JSON parsing and manipulation - Type coercion and conversion - Truthy and falsy evaluations - Primitive and complex data types |
| Server Side JavaScript | 8% | - Node.js fundamentals - Package management (npm) - Server-side JavaScript implementations - Core Node.js modules - CLI commands |
| Debugging and Error Handling | 7% | - Custom error types - Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) |
| Asynchronous Programming | 13% | - Promises (creation, chaining, error handling) - Async/Await syntax - Event loop and execution flow - Callbacks - Asynchronous patterns for business requirements |
| Testing | 7% | - Test effectiveness evaluation - Writing and modifying unit tests - Test coverage and reliability - Unit testing concepts |
| Browser and Events | 17% | - Browser Developer Tools usage - Browser-specific APIs - Event propagation (bubbling and capturing) - DOM manipulation - Interacting with forms and user input - Event handling and listeners |
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NEW QUESTION # 143
A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?
Answer: B
NEW QUESTION # 144
Refer to the code snippet:
Function getAvailabilityMessage(item) {
If (getAvailability(item)){
Var msg ="Username available";
}
Return msg;
}
A developer writes this code to return a message to user attempting to register a new
username. If the username is available, variable.
What is the return value of msg hen getAvailabilityMessage ("newUserName" ) is
executed and getAvailability("newUserName") returns false?
Answer: D
NEW QUESTION # 145
A developer wrote a fizzbuzz function thatwhen passed in a number, returns the following:
'Fizz' if the number is divisible by 3.
'Buzz' if the number is divisible by 5.
'Fizzbuzz' if the number is divisible by both 3 and 5.
Empty string if the number is divisible by neither 3 or 5.
Whichtwo test caseswill properly test scenarios for the fizzbuzz function?
Choose 2 answers
Answer: B,C,D
NEW QUESTION # 146
Which two code snippets show working examples of a recursive function?
Choose 2 answers
A)
B)
C)
D)
Answer: A,D
NEW QUESTION # 147
A developer uses a parsed JSON string to work with user information as in the block below:
Which two option access the email attributes in the object? Choose 2 answers
Answer: B,D
NEW QUESTION # 148
......
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