Python Institute JSA-41-01 問題練習

Question No : 1
console.log(a == b, a === b);

• A.false false
• B.true false
• C.true true
• D.false true

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Question No : 2
You are working on a web application that fetches user data from a remote server using the Fetch API. You need to handle the response correctly to update the UI with the user's information.
What is the correct way to handle the asynchronous fetch request to ensure that the user data is correctly processed and displayed?

• A.const response = fetch('https://api.example.com/user/1');const data = response.json();console.log(data);
• B.fetch('https://api.example.com/user/1') .then(response => response.json()) .then(data => { console.log(data); }) .catch(error => console.error('Error:', error));
• C.fetch('https://api.example.com/user/1') .then(response => { const data = response.json(); console.log(data); });
• D.async function fetchData() { const response = await fetch('https://api.example.com/user/1'); const data = response.json(); console.log(data);}fetchData();

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Question No : 3
console.log(iterator.next().value); // ?
What will be the output of the above code?

• A.10101010
• B.102030undefined
• C.undefinedundefinedundefinedundefined
• D.10203040

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Question No : 4
console.log(counter.increment()); // Output?
What will be the output of the above code when it is executed?

• A.undefinedundefinedundefined
• B.1-10
• C.101
• D.000

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Question No : 5
Which of the following correctly generates a random integer between 1 and 10 (inclusive)?

• A.return Math.ceil(Math.random() * 10);
• B.return Math.floor(Math.random() * 10) + 1;
• C.return Math.abs(Math.random() * 10);
• D.return Math.round(Math.random() * 10);

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Question No : 6
Which of the following code snippets correctly demonstrates creating a new array by merging two arrays using the spread operator, and then adding a new element to the beginning of the merged array?

• A.let arr1 = [1, 2, 3];let arr2 = [4, 5, 6];let merged = [...arr1, ...arr2];merged.unshift(0);
• B.let arr1 = [1, 2, 3];let arr2 = [4, 5, 6];let merged = [...arr1, ...arr2];merged.push(0);
• C.let arr1 = [1, 2, 3];let arr2 = [4, 5, 6];let merged = [arr1, arr2];merged.unshift(0);
• D.let arr1 = [1, 2, 3];let arr2 = [4, 5, 6];let merged = arr1.concat(...arr2);merged.unshift(0);

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Question No : 7
console.log(myCar);
What will be the output of console.log(myCar)?

• A.{ make: 'Toyota', model: 'Corolla', year: undefined }
• B.{ year: 2020 }
• C.{ make: 'Toyota', model: 'Corolla' }
• D.{ make: 'Toyota', model: 'Corolla', year: 2020 }

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Question No : 8
console.log(countries.CAN.population);

• A.countries[countryCode].population = newPopulation;
• B.countries.update(countryCode, { population: newPopulation });
• C.countries.countryCode.population = newPopulation;
• D.countries[countryCode] = { population: newPopulation };

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Question No : 9
console.log(myBook.getDetails());

• A.1984 by George Orwell
• B.Animal Farm by George Orwell
• C.1984 by undefined
• D.Animal Farm by undefined

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Question No : 10
Which of the following regular expressions will correctly validate if the given string "A1b2C3" follows the pattern of alternating letters and digits?

• A./([A-Za-z][0-9]){3}/
• B./^([A-Za-z][0-9])+$/
• C./^([a-zA-Z0-9])+$/
• D./([a-zA-Z][0-9])+$/

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Question No : 11
};

• A.let dog = new animal({ breed: 'Dog'});
• B.let dog = function(animal) { this.breed = 'Dog';};
• C.let dog = Object.create(animal, { breed: { value: 'Dog' }});
• D.let dog = animal.create({ breed: 'Dog'});

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Question No : 12
console.log(countries.GER);

• A.countries.GER = { name: 'Germany', population: 83000000 };
• B.countries.set('GER', { name: 'Germany', population: 83000000 });
• C.countries.add('GER', { name: 'Germany', population: 83000000 });
• D.countries.push({ GER: { name: 'Germany', population: 83000000 } });

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Question No : 13
You want to add a method first to the Array prototype that returns the first element of the array.
Which of the following code snippets correctly achieves this?

• A.Array.first = function() { return this[0];}
• B.Array.prototype.first = function() { return this[0];}
• C.Array.prototype.first = () => { return this[0];}
• D.Array.prototype.first = function() { return this.first();}

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Question No : 14
Which of the following statements correctly demonstrates how to add a key-value pair to a Map object, and how to retrieve a value using the key?

• A.let myMap = new Map();myMap.add('key1', 'value1');let value = myMap.get('key1');
• B.let myMap = new Map();myMap['key1'] = 'value1';let value = myMap.get('key1');
• C.let myMap = new Map();myMap.set('key1', 'value1');let value = myMap.key1;
• D.let myMap = new Map();myMap.set('key1', 'value1');let value = myMap.get('key1');

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Question No : 15
Which of the following best describes how to create a classless object that includes methods in JavaScript?

• A.const createObject = { name: 'object', getName: function() { return this.name; }};
• B.const createObject = new Object({ name: 'object', getName: function() { return this.name; }});
• C.const createObject = {};createObject.name = 'object';createObject.getName = function() { return this.name;};
• D.function createObject() { this.name = 'object'; this.getName = function() { return this.name; };}

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