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| Section | Weight | Objectives |
|---|---|---|
| Server Side JavaScript | 8% | - Node.js applications - Salesforce API integration - Modules and file operations |
| Testing | 7% | - Automated testing strategies - Test-driven development principles - Unit testing with Jest |
| Asynchronous Programming | 13% | - Promises and async/await - Event loop and asynchronous code execution - Callback patterns |
| Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
| Browser and Events | 17% | - Event handling, propagation, bubbling, and capturing - Browser Developer Tools - DOM manipulation |
| Variables, Types, and Collections | 23% | - String manipulation and Date objects - Array manipulation (map, filter, reduce, forEach, find) - Type coercion and type conversion - Variable declaration (var, let, const, scoping, hoisting) - JSON parsing and stringification |
| Objects, Functions, and Classes | 25% | - Function declarations, expressions, and arrow functions - Object creation, properties, and prototypal inheritance - Higher-order functions and closures - ES6 Classes, constructors, methods, and inheritance - JavaScript modules (export, import) |
>> Valid JS-Dev-101 Test Question <<
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NEW QUESTION # 132
Console logging methods that allow string substitution:
Answer: A,C,D,E
Explanation:
The correct answers are B, C, D, and E.
JavaScript browser consoles support string substitution in several console output methods. String substitution means using placeholders such as:
%s
%d
%i
%f
%o
%O
%c
Example:
console.log("User name is %s and age is %d", "Alex", 25);
Output:
User name is Alex and age is 25
The valid console methods from the given options are:
Option
Method
Correct?
Reason
A
message
No
console.message() is not a standard console method.
B
log
Yes
console.log() supports formatted string substitution.
C
assert
Yes
console.assert() can output a formatted message when the assertion is false.
D
info
Yes
console.info() supports formatted output like console.log().
E
error
Yes
console.error() supports formatted output and displays an error-style message.
Example with these valid methods:
console.log("Name: %s", "John");
console.info("Score: %d", 95);
console.error("Error code: %d", 500);
console.assert(false, "Failed check for user: %s", "Admin");
So the verified answers are B, C, D, and E.
NEW QUESTION # 133
Consider type coercion, what does the following expression evaluate to?
True + 3 + '100' + null
Answer: C
NEW QUESTION # 134
Code:
01 const sayHello = (name) => {
02 console.log('Hello ', name);
03 };
04
05 const world = () => {
06 return 'World';
07 };
08
09 sayHello(world);
This does not print "Hello World".
What change is needed?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Currently:
sayHello expects a value name and prints it.
world is a function that returns 'World'.
sayHello(world); passes the function object itself, not the result of calling it.
So name inside sayHello is a function, not the string "World".
To keep the call sayHello(world) yet get "World", sayHello must call the function parameter:
const sayHello = (name) => {
console.log('Hello', name());
};
Now:
sayHello(world) passes the function.
Inside sayHello, name() calls world(), which returns "World".
The console logs "Hello World".
Why the others are wrong:
B: Changing line 7 to }(); would attempt to IIFE the function definition and break the declaration.
C: sayHello(world)() would try to call the return value of sayHello, which is undefined, causing an error.
D: Changing world to a function declaration does not change the fact that it is passed as a function reference; sayHello still prints the function object, not 'World'.
________________________________________
NEW QUESTION # 135
function myFunction() {
a = a + b;
var b = 1;
}
myFunction();
console.log(a);
console.log(b);
Which statement is correct?
Answer: A
Explanation:
The correct answer is A, not D.
Inside myFunction(), the declaration:
var b = 1;
is hoisted to the top of the function scope, but only the declaration is hoisted, not the assignment. So internally, JavaScript treats the function approximately like this:
function myFunction() {
var b;
a = a + b;
b = 1;
}
Now examine this line:
a = a + b;
Before JavaScript can assign a value to a, it must first evaluate the right-hand side:
a + b
At this point:
b
exists locally because var b was hoisted, so its value is:
undefined
However:
a
has not been declared anywhere. Reading an undeclared variable causes a:
ReferenceError
So this line throws an error before assignment happens:
a = a + b;
Because the error occurs on that line, the next line inside the function is never executed:
var b = 1;
Also, because the error is not handled with try...catch, the program stops before reaching:
console.log(a);
console.log(b);
Therefore, the accurate statement is:
Line 02 throws a reference error, therefore line 03 is never executed.
So the verified answer is A.
NEW QUESTION # 136
Given the code below:
01 const delay = async delay => {
02 return new Promise((resolve, reject) => {
03 console.log(1);
04 setTimeout(resolve, delay);
05 });
06 };
07
08 const callDelay = async () => {
09 console.log(2);
10 const yup = await delay(1000);
11 console.log(3);
12 };
13
14 console.log(4);
15 callDelay();
16 console.log(5);
What is logged to the console?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Execution order:
Top-level code runs synchronously:
Line 14: console.log(4); → logs 4.
Line 15: callDelay(); is called.
Inside callDelay:
Line 9: console.log(2); → logs 2.
Line 10: await delay(1000);:
Calls delay(1000).
Inside delay(1000):
Line 3: console.log(1); → logs 1.
Line 4: setTimeout(resolve, delay); schedules resolve in 1000 ms.
delay returns a pending Promise. await pauses callDelay here and returns control to the event loop.
Back to top-level:
Line 16: console.log(5); → logs 5.
So synchronous log sequence is: 4, 2, 1, 5.
After ~1000 ms:
The setTimeout in delay resolves the Promise.
The await in callDelay resumes.
Line 11: console.log(3); → logs 3.
Final log order: 4 2 1 5 3.
Both A and B show the same sequence; one must be chosen, so A is correct.
Concepts: async/await flow, Promise resolution timing, event loop, and ordering of synchronous vs timer callbacks.
________________________________________
NEW QUESTION # 137
......
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