JavaScript Developer I

Refer to the code below: Which value can a developer expect when referencing country,capital,city String?A . 'London'B . undefinedC . An errorD . 'NaN'View AnswerAnswer: D

Refer to the code below: let sayHello = () => { console.log (‘Hello, world!’); }; Which code executes sayHello once, two minutes from now?A . setTimeout(sayHello, 12000);B . setInterval(sayHello, 12000);C . setTimeout(sayHello(), 12000);D . delay(sayHello, 12000);View AnswerAnswer: A

developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript. Which...

Given the following code: document.body.addEventListener(‘ click ’, (event) => { if (/* CODE REPLACEMENT HERE */) { console.log(‘button clicked!’); ) }); Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?A . Event.clickedB . e.nodeTarget ==thisC . event.target.nodeName...

Refer to the code below: Let car1 = new Promise((_ , reject) => setTimeout(reject, 2000, “car 1 crashed in” => Let car2 =new Promise(resolve => setTimeout(resolve, 1500, “car 2 completed”) Let car3 =new Promise(resolve => setTimeout(resolve, 3000, “car 3 completed”) Promise.race(( car1, car2, car3)) .then (value => ( Let result...

Given the following code: document.body.addEventListener(‘ click ’, (event) => { if (/* CODE REPLACEMENT HERE */) { console.log(‘button clicked!’); ) }); Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?A . Event.clickedB . e.nodeTarget ==thisC . event.target.nodeName...

Consider type coercion, what does the following expression evaluate to? True + 3 + ‘100’ + nullA . 104B . 4100C . ‘3100null’D . ‘4100null’View AnswerAnswer: D

Refer to code below: Let productSKU = ‘8675309’ ; A developer has a requirement to generate SKU numbers that are always 19 characters lon, starting with ‘sku’, and padded with zeros. Which statement assigns the values sku 0000000008675309?A . productSKU = productSKB . padStart (19. ‘0’).padstart(‘sku’);C . productSKU = productSKD...

Refer to the code below: Async funct on functionUnderTest(isOK) { If (isOK) return ‘OK’ ; Throw new Error(‘not OK’); ) Which assertion accuretely tests the above code?A . Console.assert (await functionUnderTest(true), ‘ OK ’)B . Console.assert (await functionUnderTest(true), ‘ not OK ’)C . Console.assert (await functionUnderTest(true), ‘ not OK ’)D...

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);View AnswerAnswer: A