Online Access Free JavaScript-Developer-I Exam Questions

Refer to the code below:
< html >
< body >
< div id= " logo " > Hello Logo! < /div >
< button id= " test " > Click me < /button >
< /body >
< script >
function printMessage(event) {
console.log( ' This is a test message ' );
}
let el = document.getElementById( ' test ' );
el.addEventListener( " click " , printMessage, false);
< /script >
< /html >
Which action should be done?

• A.Add event.stopPropagation(); to printMessage function
• B.Add event.stopPropagation(); to window.onload event handler
• C.Add event.removeEventListener(); to window.onload event handler
• D.Add event.removeEventListener(); to printMessage function

Given two expressions, exp1 and exp2, which two valid ways return the logical AND of the two expressions and ensure it is a Boolean?

• A.Boolean(var1) & & Boolean(var2)
• B.exp1 & exp2
• C.Boolean(exp1 & & exp2)
• D.Boolean(exp1) & & Boolean(exp2)

Refer to the code below:
class Student {
constructor(name) {
this._name = name;
}
displayGrade() {
console.log(`${this._name} got 70% on test.`);
}
}
class GraduateStudent extends Student {
constructor(name) {
super(name);
this._name = " Graduate Student " + name;
}
displayGrade() {
console.log(`${this._name} got 100% on test.`);
}
}
let student = new GraduateStudent( " Jane " );
student.displayGrade();
What is the console output?

• A.Jackie got 70% on test.
• B.Better student Jackie got 70% on test.
• C.Uncaught ReferenceError
• D.Graduate Student Jane got 100% on test.

Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?

• A.5-5
• B.5-10
• C.10-10
• D.10-5

A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = " Username available " ;
return msg;
}
}

• A." Username available "
• B.undefined
• C." newUserName "
• D." msg is not defined "