Online Access Free CRT-600 Exam Questions

The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum;
Which two tests are most accurate for this code?
Choose 2 answers

• A.console.assert(toNumber('-3') < 0);
• B.console.assert(Number.isNaN(toNumber()));
• C.console.assert(toNumber () === NaN);
• D.console.assert(toNumber('2') === 2);

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 to make this code work as expected?

• A.Replace line 02 with button.addEventListener("onclick", function() {
• B.Replace line 02 with button.addCallback("click", function() {
• C.Replace line 03 with const input = document.getElementByName('input');
• D.Replace line 04 with console.log(input .value);

Given the following code:

What will be the first four numbers logged?

• A.0122
• B.0123
• C.0112
• D.0012

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 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?

• A.04 const reader = new File();
  08 if (file) reader.readAsDataURL(file);
• B.04 const reader = new FileReader();
  08 if (file) URL.createObjectURL(file);
• C.04 const reader = new File();
  08 if (file) URL.createObjectURL(file);
• D.04 const reader = new FileReader();
  08 if (file) reader.readAsDataURL(file);

Refer to the code below:
let sayHello = () => {
console.log ('Hello, world!');
};
Which code executes sayHello once, two minutes from now?

• A.delay(sayHello, 12000);
• B.setTimeout(sayHello(), 12000);
• C.setInterval(sayHello, 12000);
• D.setTimeout(sayHello, 12000);