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NEW QUESTION # 145
Given the code:
01 function GameConsole(name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log('${this.name} is loading a game: ${gamename}....');
07 }
08
09 function Console16bit(name) {
10 GameConsole.call(this, name);
11 }
12
13 Console16bit.prototype = Object.create(GameConsole.prototype);
14
15 // insert code here
16 console.log('${this.name} is loading a cartridge game: ${gamename}....');
17 }
18
19 const console16bit = new Console16bit('SNEGeneziz');
20 console16bit.load('Super Monic 3x Force');
What should a developer insert at line 15?
Answer: B
Explanation:
A subclass created by:
Console16bit.prototype = Object.create(GameConsole.prototype);
inherits all prototype methods from GameConsole, including load.
To override the inherited method, the correct syntax is to assign a new function to the method name on the prototype:
Console16bit.prototype.load = function(gamename) {
console.log(`${this.name} is loading a cartridge game: ${gamename}....`);
};
Why the other options are wrong:
A assigns something to the constructor function itself, not to the prototype method. Invalid.
B attempts to call a function in the left-hand side of an assignment; invalid syntax.
C also uses invalid syntax-prototype methods cannot be defined this way.
D is the correct definition of a prototype method override.
JavaScript Knowledge Reference (text-only)
Methods are overridden by assigning functions to Subclass.prototype.methodName.
Object.create() establishes prototype inheritance.
Constructor functions require prototype method attachment using assignment syntax.
NEW QUESTION # 146
Given two expressions, `exp1` and `exp2`, which two valid ways to return the logical AND of the two expressions and ensure it is a boolean?
Answer: A,D
NEW QUESTION # 147
A developer at Universal Containers is creating their new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage is fully loaded (HTML content and all related files), in order to do some custom initializations.
Which implementation should be used to call Fe:s:-a;::eHec5;te::.-.ter.: based on the business requirement above?
Answer: D
NEW QUESTION # 148
Which two console logs output NaN?
Answer: B,D
Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
Recall:
NaN stands for "Not-a-Number".
Arithmetic involving non-numeric values that cannot be converted to numbers often results in NaN.
Check each:
A . 10 / 0
In JavaScript, dividing a positive number by 0 results in Infinity, not NaN.
So this logs Infinity.
B . parseInt('two')
parseInt tries to parse a numeric prefix from the string.
'two' does not start with numeric digits, so parseInt('two') returns NaN.
The console log prints NaN.
C . 10 / Number('5')
Number('5') โ 5.
10 / 5 โ 2.
Logs 2, not NaN.
D . 10 / 'five'
'five' is coerced to a number using Number('five'), which is NaN.
10 / NaN โ NaN.
Logs NaN.
So the console logs that output NaN are from B and D.
Relevant concepts: NaN, Infinity, parseInt, Number() coercion, arithmetic with invalid numeric values.
________________________________________
NEW QUESTION # 149
let sampleText = "The quick brown fox jumps";
Which three expressions return true for a substring?
Answer: A,B,C
Explanation:
The correct answers are A, B, and C.
The original variable name appears to contain a typing error. The variable should be used consistently as sampleText:
let sampleText = "The quick brown fox jumps";
A is correct because includes() checks whether a string contains a specific substring and returns a Boolean value:
sampleText.includes('fox');
Since "fox" exists inside "The quick brown fox jumps", this returns:
true
B is correct after correcting the typing error. The correct expression is:
sampleText.indexOf('quick') > -1;
indexOf() returns the index position where the substring is found. If the substring is not found, it returns -1.
Since "quick" exists in the string, sampleText.indexOf('quick') returns a value greater than -1, so the expression returns:
true
C is correct after correcting the missing quotation marks and adding a Boolean comparison:
sampleText.indexOf('fox') !== -1;
The substring "fox" exists in the string, so indexOf('fox') does not return -1. Therefore, the expression returns:
true
D is incorrect because the method name is typed incorrectly. JavaScript string has includes(), not include().
Incorrect:
sampleText.include('fox')
Correct:
sampleText.includes('fox')
E is incorrect because JavaScript string matching is case-sensitive:
sampleText.indexOf('Quick') !== -1;
The string contains "quick" with a lowercase q, not "Quick" with an uppercase Q, so this returns:
false
Therefore, the verified answers are A, B, and C.
NEW QUESTION # 150
......
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