Free Salesforce JavaScript-Developer-I Practice Test & Real Exam Questions

Refer to the code below:
01 function myFunction(reassign) {
02 let x = 1;
03 var y = 1;
04
05 if (reassign) {
06 let x = 2;
07 var y = 2;
08 console.log(x);
09 console.log(y);
10 }
11
12 console.log(x);
13 console.log(y);
14 }
What is displayed when myFunction(true) is called?

01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result?

A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
01 const sumFunction = arr = > {
02 return arr.reduce((result, current) = > {
03 //
04 result += current;
05 //
06 }, 10);
07 };
Which line replacement makes the code work as expected?

Corrected code:
let obj = {
foo: 1,
bar: 2
};
let output = [];
for (let something in obj) {
output.push(something);
}
console.log(output);
What is the output of line 11?

A developer executes:
document.cookie;
document.cookie = ' key=John Smith ' ;
What is the behavior?

Refer to the code:
01 let car1 = new Promise((_, reject) = >
02 setTimeout(reject, 2000, " Car 1 crashed in " ));
03 let car2 = new Promise(resolve = >
04 setTimeout(resolve, 1500, " Car 2 completed " ));
05 let car3 = new Promise(resolve = >
06 setTimeout(resolve, 3000, " Car 3 completed " ));
07
08 Promise.race([car1, car2, car3])
09 .then(value = > {
10 let result = ' $(value) the race. ' ;
11 })
12 .catch(err = > {
13 console.log( " Race is cancelled. " , err);
14 });
What is the value of result when Promise.race executes?

Value of:
true + 3 + ' 100 ' + null

Refer to the following object:
01 const cat = {
02 firstName: ' Fancy ' ,
03 lastName: ' Whiskers ' ,
04 get fullName(){
05 return this.firstName + ' ' + this.lastName;
06 }
07 };
How can a developer access the fullName property for cat?