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NEW QUESTION # 83
Teams at Universal Containers (UC) work on multiple JavaScript projects at the same time.
UC is thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?
Answer: C
NEW QUESTION # 84
Given the code:
const copy = JSON.stringify([new String('false'), new Boolean(false), undefined]); What is the value of copy?
Answer: A
Explanation:
JSON.stringify() applies the following rules:
String objects (new String('false'))
Are converted to their primitive string values.
So:
new String("false") โ "false"
Boolean objects (new Boolean(false))
Convert to their primitive boolean value:
new Boolean(false) โ false
Undefined values inside arrays
According to the JSON specification, undefined becomes null when stringifying an array:
JSON.stringify([undefined]) โ "[null]"
Therefore, the array becomes:
["false", false, null]
And JSON.stringify wraps it in quotes:
'["false", false, null]'
This is exactly option A.
JavaScript Knowledge Reference (text-only)
Object wrappers (String, Boolean) are converted to primitives during JSON serialization.
undefined becomes null inside arrays when stringified.
JSON.stringify() follows the JSON data-model rules strictly.
NEW QUESTION # 85
Refer to the code below:
What is the result when the Promise in the execute function is rejected?
Answer: D
NEW QUESTION # 86
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
This question focuses on the typeof operator and how JavaScript represents the type of the value null.
Declaration on line 1:
let x = null;
Here:
x is explicitly assigned the value null.
In JavaScript, null is a special primitive value that represents "no value" or "empty value".
Line 2:
console.log(typeof x);
The typeof operator returns a string indicating the type of the operand. For example:
typeof 1 returns "number"
typeof "hello" returns "string"
typeof true returns "boolean"
typeof undefined returns "undefined"
typeof {} returns "object"
typeof [] returns "object" (arrays are objects)
typeof function() {} returns "function"
For null, due to an early design decision in JavaScript, the result is:
typeof null === "object"
This is a known historical quirk of the language:
Although null is a primitive and conceptually means "no object", typeof null returns the string "object".
Therefore, typeof x when x is null evaluates to "object".
So on line 2, the value printed is:
"object"
This matches option A.
The incorrect options are:
B . "undefined": would be typeof x if x were undefined, not null.
C . "x": typeof returns a string describing the type of the value, not the variable name.
D . "null": although intuitive, JavaScript does not return "null" for typeof null; it returns "object" instead.
Therefore, the correct answer is:
JavaScript knowledge / study guide reference concepts:
typeof operator and its return values
Primitive types in JavaScript (null, undefined, number, string, boolean, symbol, bigint) Historical behavior: typeof null returning "object" Difference between null and undefined in JavaScript
NEW QUESTION # 87
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading agame : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game :$(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the method ?
> SNEGeneziz is loading a cartridgegame: Super Monic 3x Force . . .
Answer: B
NEW QUESTION # 88
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