JavaScript Developer I exam

is below: <input type=”file” onchange=”previewFile()”> <img src=”” height=”200” alt=”Image Preview…”/> The JavaScript portion is: 01 function previewFile(){ 02 const preview = document.querySelector(‘img’); 03 const file = document.querySelector(‘input[type=file]’).files[0]; 04 //line 4 code 05 reader.addEventListener(“load”, () => { 06 preview.src = reader.result; 07 },false); 08 //line 8 code 09 } In lines...

A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letter N. Const arrObj = [{“name” : “Zach”}, {“name” : “Kate”},{“name” : “Alise”},{“name” : “Bob”},{“name” : “Natham”},{“name” : “nathaniel”} Refer to the code snippet below:...

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”]View AnswerAnswer: C

bar, awesome is a popular JavaScript module. the versions publish to npm are: Teams at Universal Containers use this module in a number of projects. A particular project has the package, json definition below. A developer runs this command: npm install. Which version of bar .awesome is installed?A . 1.3.1...

The developer wants to test the array shown: const arr = Array(5).fill(0) Which two tests are the most accurate for this array? Choose 2 answers:A . console.assert( arr.length === 5 ); B. arr.forEach(elem => console.assert(elem === 0)) ; C. console.assert(arr[0] === 0 && arr[ arr.length] === 0); D. console.assert (arr.length...

Refer to the code below: console.log(‘’start); Promise.resolve(‘Success’). then(function(value) { console.log(‘Success’); }); console.log(‘End’); What is the output after the code executes successfully?A . End Start Success B. Start Success End C. Start End Success D. Success Start EndView AnswerAnswer: C

Given the following code: Let x =null; console.log(typeof x); What is the output of the line 02?A . “Null” B. “X” C. “Object” D. “undefined”View AnswerAnswer: C

A developer has the following array of hourly wages: Let arr = (8, 5, 9, 75, 11, 25, 7, 75, 13, 25); For workers making less than $10 an hour rate should be multiple by 1.25 and returned in a new array. How should the developer implement the request?A ....

CORRECT TEXT Given the requirement to refactor the code above to JavaScript class format, which class definition is correct? A) B) C) D) A . Option A B. Option B C. Option C D. Option DView AnswerAnswer: A

Refer to the code below: Let textValue = ’1984’; Which code assignment shows a correct way to convert this string to an integer?A . let numberValue = Number(textValue); B. Let numberValue = (Number)textValue; C. Let numberValue = textValue.toInteger(); D. Let numberValue = Integer(textValue);View AnswerAnswer: A