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NEW QUESTION # 83
Given the JavaScript below:
01 function filterDOM(searchString){
02 const parsedSearchString = searchString && searchString.toLowerCase();
03 document.querySelectorAll('.account').forEach(account => {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* Insert code here */
06 });
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
Line 05 uses the conditional (ternary) operator:
condition ? valueIfTrue : valueIfFalse
In this specific code:
account.style.display = accountName.includes(parsedSearchString)
? /* valueIfTrue */
: /* valueIfFalse */;
accountName.includes(parsedSearchString) returns:
true if the accountName string contains the parsedSearchString,
false otherwise.
The requirement is:
Hide accounts that do not match the search string.
That means:
If the account name includes the search string → it should be visible.
If the account name does not include the search string → it should be hidden.
The relevant property is:
account.style.display
For the display property:
Common values for showing elements:
'block', 'inline', 'inline-block', etc.
Common value for hiding elements:
'none' (element is not rendered and takes up no space).
So we want:
When accountName.includes(parsedSearchString) is true → show the element, e.g. display = 'block'.
When false → hide the element, display = 'none'.
Therefore the assignment should be:
account.style.display = accountName.includes(parsedSearchString) ? 'block' : 'none'; This matches option A:
'block' : 'none'
Why other options are incorrect:
B . 'none' : 'block'
This would hide matching accounts and show non-matching accounts, which is the opposite of the requirement.
C . 'hidden' : 'visible'
These are not valid values for the display property; they belong to the visibility property (visibility: 'hidden' | 'visible'), not display.
D . 'visible' : 'hidden'
Same issue as C: not valid for display, and reversed logic compared to requirement.
Thus, to correctly show matching accounts and hide non-matching ones, the ternary must be:
'block' : 'none'
Reference of JavaScript knowledge documents or Study Guide (concept names only):
Conditional (ternary) operator condition ? exprIfTrue : exprIfFalse
String.prototype.includes for substring checks
DOM APIs: document.querySelectorAll and forEach on NodeLists
Element styling via element.style.display
CSS display property: block vs none
________________________________________
NEW QUESTION # 84
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?
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
We must understand pass-by-value for primitives in JavaScript.
Initial values:
let a = 10;
let b = a; // b gets a copy of the value 10
So:
a is 10
b is 10 (independent copy)
Function call:
changeValue(b);
Function definition:
function changeValue(param) {
param = 5;
}
param receives the value of b, which is 10.
Inside the function, param is a local variable.
param = 5; changes only this local copy.
It does not affect b outside the function.
After the function call:
a is still 10.
b is still 10.
Result:
const result = a + ' - ' + b;
a is 10.
b is 10.
String concatenation: '10 - 10'.
So result is:
"10 - 10"
Therefore, the correct option is:
Study Guide Concepts:
Primitive values (numbers, strings, booleans) are passed by value
Function parameters as local variables
String concatenation with +
Difference between mutating references vs primitives
________________________________________
NEW QUESTION # 85
Refer to the following code:
01 function Tiger(){
02this.Type = 'Cat';
03 this.size = 'large';
04 }
05
06 let tony = new Tiger();
07 tony.roar = () =>{
08 console.log('They\'re great1');
09 };
10
11 function Lion(){
12 this.type = 'Cat';
13 this.size = 'large';
14 }
15
16 let leo = new Lion();
17 //Insertcode here
18 leo.roar();
Which two statements could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers.
Answer: A,D
NEW QUESTION # 86
A developer has two ways to write a function:
Option A:
01 function Monster() {
02 this.growl = () => {
03 console.log("Grr!");
04 }
05 }
Option B:
01 function Monster() {};
02 Monster.prototype.growl = () => {
03 console.log("Grr!");
04 }
After deciding on an option, the developer creates 1000 monster objects. How many growl methods are created with Option A and Option B?
Answer: A
Explanation:
Option A:
this.growl = () => { ... } inside the constructor creates a new function per instance.
For 1000 new Monster(), you get 1000 distinct growl functions, each stored on the instance itself.
Option B:
Monster.prototype.growl = () => { ... } attaches growl to the prototype.
All instances share the same single growl function via the prototype chain.
For 1000 instances, only 1 growl method exists in memory.
So: Option A → 1000; Option B → 1.
NEW QUESTION # 87
Refer to the code below:
const car = {
price:100,
getPrice:function(){
return this.price;
}
};
const customCar = Object.create(car);
customCar.price = 70;
delete customCar.price;const result = customCar.getPrice();
Whatis the value of result after the code executes?
Answer: A
NEW QUESTION # 88
......
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