Salesforce JS-Dev-101 Dumps - Pass Salesforce Certified JavaScript Developer Exam in First Attempt 2026

objA is created with:

{ value: 10 }

objB = objA;

Objects in JavaScript are assigned by reference, not copied.

So objA and objB refer to the same object in memory.

The function:

changeValue(obj) {

obj.value = obj.value / 2;

}

When called as changeValue(objB), it updates the value property of the shared object:

value = 10 / 2 5

Therefore:

objA.value === 5

Because objA and objB refer to the same object, the change is reflected in both.

JavaScript Knowledge Reference (text-only)

Objects are stored and passed by reference.

Mutating an object inside a function mutates the original object.

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The correct answers are A and B.

The original question contains a typing error where 66 should be corrected to the logical AND operator:

&&

A is correct because it first evaluates the logical AND expression and then converts the final result to a Boolean:

Boolean(exp1 && exp2)

The && operator returns the first falsy value or the last truthy value. Wrapping the result in Boolean() ensures the final result is strictly either:

true

or:

false

Example:

Boolean('hello' && 123);

This returns:

true

B is also correct because it converts both expressions to Boolean values first, then applies logical AND:

Boolean(exp1) && Boolean(exp2)

This guarantees that both sides of the && operation are Boolean values.

Example:

Boolean('hello') && Boolean(123);

This returns:

true

C is incorrect because it uses the bitwise AND operator:

&

This is not the same as logical AND:

&&

Bitwise AND converts values into numbers and compares their binary representation. It does not reliably return a Boolean logical result.

D is incorrect as written because the question gives the expressions as exp1 and exp2, but option D uses var1 and var2. After correction, it would be the same idea as option B.

Therefore, the verified answers are A and B.

We want to convert the number 1982 to a string.

Check each option:

A . numValue.toText()

There is no standard toText() method on numbers.

This will result in TypeError: numValue.toText is not a function.

B . String(numValue);

String() as a function converts its argument to a string.

String(1982) returns '1982'.

This is correct.

C . '' + numValue;

'' is a string; + with a string operand performs string concatenation.

'' + 1982 '1982'.

This is a common shorthand for number-to-string conversion.

D . numValue.toString();

Number.prototype.toString() converts the number to its string representation.

1982..toString() or (1982).toString() returns '1982'.

For the variable, numValue.toString() is valid: '1982'.

When async is added to a function:

async function example() {}

JavaScript guarantees:

The function always returns a Promise, regardless of what is returned inside.

Inside the function, await pauses execution until a Promise resolves.

Code appears synchronous even though it uses asynchronous behavior.

Analysis of each option:

A incorrect:

Not 'sometimes'---an async function always returns a Promise.

B incorrect:

Async functions can be called just like normal functions.

C incorrect:

Async/await has nothing to do with classes specifically.

D correct:

This is the standard description:

''Async functions behave asynchronously but allow writing code that looks synchronous.''

JavaScript Knowledge Reference (text-only)

async functions always return Promises.

await pauses execution of the async function.

Async/await syntax creates synchronous-looking code on top of asynchronous operations.

Person.proto is being set, but JavaScript uses Person.prototype for the prototype chain, not Person.proto.

Therefore, job is not on Person.prototype, and instances of Person do not have job via prototype.

myFather is created with new Person(), so:

myFather.firstName is 'John'.

myFather.job is undefined.

Attempting to call myFather.job() results in:

TypeError: myFather.job is not a function

So option A is correct.