Question # 1 Which statement accurately describes an aspect of promises? A. Arguments for the callback function passed to .then() are optional.B. In a .then() function, returning results is not necessary since callbacks will catch the result of a previous promise.C. .then() cannot be added after a catch.D. .then() manipulates and returns the original promise.
Click for Answer
A. Arguments for the callback function passed to .then() are optional.
Question # 2 Refer to the code below Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?
A. 10
B. 11
C. 12
D. 13
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Question # 3 Which statement parses successfully?
A. JSON. parse (""foo"');
B. JSON.parse (""foo'");
C. JSON.parse ("foo");
D. JSON.parse ("foo");
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A. JSON. parse (""foo"');
Question # 4 Refer to the following code: Let obj ={ Foo: 1, Bar: 2 } Let output =[], for(let something in obj{ output.push(something); } console.log(output); What is the output line 11?
A. [1,2]
B. [“bar”,”foo”]
C. [“foo”,”bar”]
D. [“foo:1”,”bar:2”]
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Question # 5 A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console. Here is the HTML file content: <input type =” text” value=”Hello” name =”input”> <button type =”button” >Display </button> The developer wrote the javascript code below: Const button = document.querySelector(‘button’); button.addEvenListener(‘click’, () => ( Const input = document.querySelector(‘input’); console.log(input.getAttribute(‘value’)); When the user clicks the button, the output is always “Hello”. What needs to be done make this code work as expected?
A. Replace line 04 with console.log(input .value);
B. Replace line 03 with const input = document.getElementByName(‘input’);
C. Replace line 02 with button.addEventListener(“onclick”, function() {
D. Replace line 02 with button.addCallback(“click”, function() {
Click for Answer
A. Replace line 04 with console.log(input .value);
Question # 6 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 Scarf This is a discounted Shirt
C. This is a Scarf This is a Shirt This is a discounted Scarf This is a discounted Shirt
D. This is aScarf Uncaught TypeError: saleItem.description is not a function This is a Shirt This is a did counted Shirt
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B. This is a Scarf This is a Shirt This is a Scarf This is a discounted Shirt
Question # 7 myArraym can have one level, two levels, or more levels. Which statement flattens myArray when it can be arbitrarily nested?
A. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);
B. myArray. join (","). split (",");
C. [ ] .concat {. . .myArray) ;
D. myArray.flat(Infinity);
Click for Answer
A. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);
Question # 8 Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
A. Option AB. Option B C. Option C D. Option D
Click for Answer
A. Option A
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