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NEW QUESTION # 101
Which two implementations of utils.js support foo and bar?
Answer: B,D
Explanation:
}
Explanation:
The correct answers are A and C because both use named exports for foo and bar.
A module can export multiple values by name:
export { foo, bar };
This allows another file to import them like this:
import { foo, bar } from './utils.js';
Option A is correct because it defines both functions locally and exports both of them as named exports.
const foo = () => { return 'foo'; };
const bar = () => { return 'bar'; };
export { foo, bar };
Option C is also correct after correcting the typing issue so that both foo and bar are imported first:
import { foo, bar } from "./helpers/utils.js";
export { foo, bar };
This is called re-exporting. The module imports foo and bar from another module, then exports them again from utils.js.
Option B is not the best answer for named access because it exports one default object:
export default { foo, bar };
That would require a default import first:
import utils from './utils.js';
utils.foo();
utils.bar();
It does not directly support named imports in the same way as:
import { foo, bar } from './utils.js';
Option D exports a default class. Its foo() and bar() are class instance methods, not named exported functions. It would require usage like:
import Utils from './utils.js';
const utils = new Utils();
utils.foo();
utils.bar();
So for direct multiple function exports, the correct implementations are A and C.
NEW QUESTION # 102
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?
Answer: A
NEW QUESTION # 103
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
Answer: C
Explanation:
In Node.js:
__filename is the absolute path to the current file (including file name).
__dirname is the absolute path to the directory that contains the current file.
window.location is a browser-only global, not available in Node.js.
this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.
NEW QUESTION # 104
Given a value, which two options can a developer use to detect if the value is NaN?
Answer: B,C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
We already know NaN is special: it is not equal to itself.
Check each:
A . value === Number.NaN
Number.NaN is NaN.
NaN === NaN is always false.
This will never be true; cannot reliably detect NaN.
B . value == NaN
NaN == NaN is also always false.
Again, this never detects NaN.
C . isNaN(value)
Global isNaN converts its argument to a number and then checks if the result is NaN.
This can detect NaN, but it may also return true for non-number values that coerce to NaN, such as isNaN('foo').
Regardless, it is a standard way to detect if a value is "NaN-like" in JavaScript.
D . Object.is(value, NaN)
Object.is(NaN, NaN) returns true.
This is a strict way to detect a value that is exactly NaN (no coercion).
Therefore, among the given choices, the two viable ways to detect NaN are:
isNaN(value)
Object.is(value, NaN)
________________________________________
NEW QUESTION # 105
Refer to the code:
01 console.log('Start');
02 Promise.resolve('Success').then(function(value) {
03 console.log('Success');
04 });
05 console.log('End');
What is the output after the code executes successfully?
Answer: C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge console.log('Start') runs immediately (synchronous).
Promise.resolve().then(...) places the callback in the microtask queue. The .then handler does not run immediately.
console.log('End') runs next (still synchronous).
After the synchronous script finishes, the microtask queue runs, logging "Success".
Execution order:
Start
End
Success
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Promise .then() callbacks execute after the current call stack finishes (microtask queue).
Synchronous logs run immediately, before promise callbacks.
NEW QUESTION # 106
......
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