Salesforce CRT-600 : Salesforce Certified JavaScript Developer I

Cloud Kicks has a class to represent items for sale in an online store, as shown below:
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?

• A. Class ClothingItem {
• B. Class ClothingItem super Item {
• C. Class ClothingItem implements Item{
• D. Class ClothingItem extends Item {

Refer to the string below:
const str = 'Salesforce';
Which two statements result in the word 'Sales'?
Choose 2 answers

• A. str.substr (0, 5);
• B. str.substring (0, 5);
• C. str.substring (1, 5);
• D. str.substr(1, 5);

Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers

• A. [ ]. Concat.apply ([ ], inArray);
• B. [ ]. Concat (... inArray);
• C. [ ]. concat.apply(inArray, [ ]);
• D. [ ]. concat ( [ ....inArray ] );

A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill ( items ) {
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?

• A. Using the debugger command on line 05.
• B. Using the debugger command on line 03
• C. Wrapping findSubtotal in a console.log() method.
• D. Calling the console.trace (total) method on line 03.

A developer wants to create an object from a function in the browser using the code below.

What happens due to the lack of the mm keyword on line 02?

• A. window.m Is assigned the correct object.
• B. window.name is assigned to 'hello' and the variable = remains undefined.
• C. The m variable is assigned the correct object but this.name remains undefined.
• D. The m variable is assigned the correct object.