2026年02月本日更新されたJavaScript-Developer-I試験問題集PDF試験エンジン無料！
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質問 # 95
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
- A. Owner
- B. Size
- C. Name
- D. Type
- E. canTalk
正解：B、D、E
質問 # 96
A developer needs to test this function:
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 the function?
Choose 2 answers
- A. console.assert(sum3(1, '2')) == 12);
- B. console.assert(sum3(-3, 2 )) == -1);
- C. console.assert(sum3('hello', 2, 3, 4)) === NaN);
- D. console.assert(sum3(0)) == 0);
正解：A、B
質問 # 97
A developer writers the code below to calculate the factorial of a given number.
Function factorial(number) {
Return number + factorial(number -1);
}
factorial(3);
What is the result of executing line 04?
- A. 0
- B. RuntimeError
- C. -Infinity
- D. 1
正解：B
質問 # 98
Teams at Universal Containers (CU) work on multiple JavaScript projects at the same time. UC us thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?
- A. Private registries are not supported by spm, but packages can be installed vis URL.
- B. Private register are not supported by npm, but packages can be installed via git.
- C. Private packages are not supported, but they can use another package manager like yarm.
- D. Private packages can be scoped, and scopes can be associated to a private registries.
正解：C
質問 # 99
A class was written to represent items for purchase in an online store, and a second class Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
... // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
Let regItem =new Item('Scarf', 55);
Let saleItem = new SaleItem('Shirt' 80, -1);
Item.prototype.description = function () { return 'This is a ' + this.name; console.log(regItem.description()); console.log(saleItem.description()); SaleItem.prototype.description = function () { return 'This is a discounted ' + this.name; } console.log(regItem.description()); console.log(saleItem.description()); What is the output when executing the code above ?
- A. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is aScarf
This is a discounted Shirt - B. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt - C. This is aScarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a did counted Shirt - D. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
正解：D
質問 # 100
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?
- A. Let arr2 = arr1.slice(0, 5);
- B. Let arr2 = arr1.sort();
- C. Let arr2 = Array.from(arr1);
- D. Let arr2 = arr1;
正解：A、C
質問 # 101
A test has a dependency on database .query. During the test the dependency is replace with an called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?
- A. Mocking
- B. Black box
- C. Integration
- D. White box
正解：C、D
質問 # 102
Given two expressions var1 and var2. What are two valid ways to return the logical AND of the two expressions and ensure it is data type Boolean ?
Choose 2 answers:
- A. var1 && var2
- B. var1.toBoolean() && var2toBoolean()
- C. Boolean(var1 && var2)
- D. Boolean(var1) && Boolean(var2)
正解：C、D
質問 # 103
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill ( items ) {
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?
- A. Calling the console.trace (total) method on line 03.
- B. Using the debugger command on line 05.
- C. Using the debugger command on line 03
- D. Wrapping findSubtotal in a console.log() method.
正解：B
質問 # 104
Given the code below.
What is logged to the console?
- A. 0
- B. 1
- C. 2
- D. 3
正解：C
質問 # 105
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill (items ){
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?
- A. Calling the console.trace (total) method on line 03.
- B. Using the debugger command on line 05.
- C. Usingthe debugger command on line 03
- D. Wrapping findSubtotal in a console.log() method.
正解：B
質問 # 106
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
質問 # 107
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as (3, 4, 5)?
Choose 3 answers
- A. Let x = arr.aplice (2, 3);
- B. Let x = arr.alice (2) ;
- C. Let x = arr.filter( (a) => )return a > 2 )) ;
- D. Let x = arr. Slince (2, 3);
- E. Let x = arr.filter( (a) => ( a < 2)) ;
正解：A、B、C
質問 # 108
A developer at Universal Containers is creating their new landing page based on HTML, CSS, and JavaScript.
The website includes multiple external resources that are loaded when the page is opened.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage is loaded and there is no need to wait for the resources to be available.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
- A. windows,addEventListener('load', personalizeWebsiteContent);
- B. windows,addEventListener('onDOMCContentLoaded', personalizeWebsiteContent);
- C. windows,addEventListener('onload', personalizeWebsiteContent);
- D. windows,addEventListener('DOMContent Loaded ', personalizeWebsiteContent);
正解：A
質問 # 109
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
- A. 02413
- B. 01234
- C. 0
- D. 02431
正解：D
質問 # 110
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