JavaScript-Developer-I Free Practice Test

Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
Thedeveloper needs to insert a code statement in the location shown. The code statement has these requirements:
* 1. Does require an import
* 2. Logs an error when the boolean statement evaluates to false
* 3. Works in both the browser and Node.js
Which meet the requirements?

1. A. assert (number % 2 === 0);
2. B. console.error(number % 2 === 0);
3. C. console.debug(number % 2 === 0);
4. D. console.assert(number % 2 === 0);

Correct Answer: B

What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers

1. A. The function generated its own this making ituseful for separating the function’s scope from its enclosing scope.
2. B. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scop
3. C. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
4. D. The function uses the this from the enclosing scope.

Correct Answer: AC

A developer is asked to fix some bugs reported by users. Todo that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){ This.maxspeed =masSpeed; This.color = color;
Let carSpeed = document.getElementById(‘ CarSpeed’); Debugger;
Let fourWheels =new Car (carSpeed.value, ‘red’);
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:

1. A. The values of the carSpeed and fourWheels variables
2. B. A variable displaying the number of instances created for theCar Object.
3. C. The style, event listeners and other attributes applied to the carSpeed DOM element
4. D. The information stored in the window.localStorage property

Correct Answer: CD

Refer to the code below:
new Promise((resolve, reject) => { const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction); resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

1. A. When rejected
2. B. When resolved and settled
3. C. WHen resolved
4. D. When resolved or rejected

Correct Answer: D

Cloud Kicks has a class to represent items for sale in an online store, as shownbelow: Class Item{
constructor (name, price){ this.name = name; this.price = price;
}
formattedPrice(){
return ‘s’ + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of the properties and methods of the Item class but will also have properties that are specific to clothes.
Which line of code properly declares the clothingItem class such that it inherits from Item?

1. A. Class ClothingItem implements Item{
2. B. Class ClothingItem {
3. C. Class ClothingItem super Item {
4. D. Class ClothingItem extends Item {

Correct Answer: D