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質問 # 29
A developer imports:
import printPrice from ' /path/PricePrettyPrint.js ' ;
What must be true about printPrice for this import to work?
正解：D
解説：
The syntax:
import printPrice from ' module ' ;
means the module must export its function as a default export :
export default function printPrice() { ... }
Why the others are wrong:
* Named exports require curly braces:
* import { printPrice } from ' module ' ;
* "all export" and "multi export" are not JavaScript terms.
Therefore, printPrice must be the default export .
JavaScript Knowledge References (text-only)
* Default imports use: import name from ' module ' .
* Named imports require braces: import { name } from ' module ' .
質問 # 30
Why does second have access to variable a?
正解：B
解説：
The answer is B because JavaScript uses lexical scope .
When a function is created inside another function, the inner function can access variables from the outer function where it was defined.
For example:
function first() {
let a = 10;
function second() {
console.log(a);
}
second();
}
Here, a belongs to the outer function first(). The inner function second() can access it because JavaScript looks for variables through the scope chain.
The lookup works like this:
1. Look inside second()
2. If not found, look inside first()
3. If not found, look in the global scope
Since a is found in the outer function's scope, second() can use it.
This is also the basis of a closure . A closure allows an inner function to remember and access variables from its outer lexical environment.
Why the other options are incorrect:
A is not the best answer because a is not declared inside second() itself.
C is incorrect because the prototype chain is used for object property lookup, not local variable scope lookup.
D is incorrect because hoisting explains how declarations are moved during compilation, but it does not explain why an inner function can access an outer function's variable.
Therefore, the verified answer is B .
質問 # 31
Which statement allows a developer to update the browser navigation history without a page refresh?
正解：A
解説：
The correct answer is C .
The browser provides the History API through:
window.history
To add a new entry to the browser's session history without refreshing the page, JavaScript uses:
window.history.pushState(state, title, url);
So the valid statement is:
window.history.pushState(newStateObject, ' ' , null);
This updates the browser history stack without forcing a full page reload. It is commonly used in single-page applications when changing views or routes dynamically.
The method accepts three arguments:
window.history.pushState(stateObject, title, url);
stateObject stores custom data associated with the history entry.
title is usually passed as an empty string because many browsers ignore it.
url optionally changes the displayed URL. Passing null means no new URL is provided.
Option A is incorrect because:
window.customHistory
is not the standard browser History API object.
Option B is incorrect because:
createState()
is not a valid History API method.
Option D is incorrect because:
updateState()
is not a valid History API method.
The correct browser API method is:
window.history.pushState()
Therefore, the verified answer is C .
質問 # 32
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?
正解：D
質問 # 33
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boot time with an event?
A)
B)
C)
D)
正解：B
質問 # 34
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