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| Section | Weight | Objectives |
|---|---|---|
| Asynchronous Programming | 13% | - Async/await syntax - Promises and chaining - Fetch API and HTTP requests - Callbacks and callback hell - Event loop and micro/macro tasks |
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Module system and require/import - Node.js fundamentals and runtime - Core Node.js modules |
| Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling - Console methods and logging |
| Variables, Types, and Collections | 23% | - Array methods and data manipulation - Type coercion and conversion rules - JSON parsing and usage - Truthy and falsy values - Working with strings, numbers, dates, and booleans - Variable declaration and initialization |
| Testing | 7% | - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks - Unit testing concepts |
| Browsers and Events | 17% | - Window and document object properties - Browser APIs and Web Storage - Script loading and execution order - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Closures and execution context - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Modules and imports/exports - Object creation, properties, and methods |
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NEW QUESTION # 147
A developer wrote a fizzbuzz function that when 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.
Which two test cases will properly test scenarios for the fizzbuss function?
Answer: A,D
NEW QUESTION # 148
Refer to the code below:
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?
Answer:
Explanation:
event.target.id =='myElement'
NEW QUESTION # 149
Refer to the code below:
Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
Answer: C
NEW QUESTION # 150
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?
Answer: C
Explanation:
We must understand pass-by-value for primitives in JavaScript.
* Initial values:
let a = 10;
let b = a; // b gets a copy of the value 10
So:
* a is 10
* b is 10 (independent copy)
* Function call:
changeValue(b);
Function definition:
function changeValue(param) {
param = 5;
}
* param receives the value of b, which is 10.
* Inside the function, param is a local variable .
* param = 5; changes only this local copy.
* It does not affect b outside the function.
After the function call:
* a is still 10.
* b is still 10.
* Result:
const result = a + ' - ' + b;
* a is 10.
* b is 10.
* String concatenation: ' 10 - 10 ' .
So result is:
" 10 - 10 "
Therefore, the correct option is:
The answer: D
Study Guide Concepts:
* Primitive values (numbers, strings, booleans) are passed by value
* Function parameters as local variables
* String concatenation with +
* Difference between mutating references vs primitives
NEW QUESTION # 151
Function to test:
01 const sum3 = (arr) = > {
02 if (!arr.length) return 0;
03 if (arr.length === 1) return arr[0];
04 if (arr.length === 2) return arr[0] + arr[1] ;
05 return arr[0] + arr[1] + arr[2];
06 };
Which two assert statements are valid tests for this function?
Answer: A,D
Explanation:
Evaluate each test:
A). sum3([1, ' 2 ' ])
* Array length is 2 # line 4: arr[0] + arr[1] # 1 + ' 2 ' # ' 12 ' (string).
* Assertion: ' 12 ' == 12 is true (type coercion). However, this "test" is not logically correct: a numeric sum function should not be expected to return ' 12 ' as a string. It passes only because of weak equality coercion, so it is not a good/valid test of correct behavior.
B). sum3([ ' hello ' , 2, 3, 4])
* Length # 3 # line 5: ' hello ' + 2 + 3 # ' hello2 ' + 3 # ' hello23 ' .
* ' hello23 ' === NaN is always false because NaN is never equal to anything, not even itself. This assertion fails and also misunderstands how NaN comparisons work.
C). sum3([-3, 2])
* Length 2 # -3 + 2 = -1.
* Assertion: -1 === -1 # true. This is a correct and meaningful test.
D). sum3([0])
* Length 1 # returns arr[0] # 0.
* Assertion: 0 === 0 # true. Also a correct and meaningful test.
Therefore, the valid and logically correct tests here are C and D.
NEW QUESTION # 152
......
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