JavaScript-Developer-I Exam Dumps : Salesforce Certified JavaScript Developer (JS-Dev-101)

console.log() in browser-side JavaScript writes output to the browser’s JavaScript console , which is available in the browser’s Developer Tools.

In a typical browser (Chrome, Firefox, Edge, etc.), you open DevTools and go to the Console tab.

Any console.log( " Page has loaded! " ); executed in page JavaScript will appear there.

Why A is correct:

The function onLoad is a client-side function (runs in the browser).

When it executes, the console.log call goes to the browser’s JavaScript console , not the server.

Why the others are incorrect:

B. On the terminal console running the web server

That console shows logs from the server-side runtime (e.g., Node.js logs).

This code is clearly browser-side JavaScript (no Node.js or server context shown).

Therefore, the output does not appear in the terminal.

C. In the browser performance tools log

Performance tools (Timeline, Performance tab, etc.) show metrics about rendering, CPU time, network, etc., not generic console.log messages.

console.log messages appear in the Console tab, not in performance logs.

D. On the webpage console log

There is no built-in concept of a “webpage console log” UI rendered on the page itself by default.

Unless you explicitly code something to display logs in the DOM, console.log output is not visible on the page, only in Developer Tools.

Therefore, the correct place to see that log is:

Answer: A

JavaScript knowledge / Study Guide references (concept names only, no links):

Browser Developer Tools – Console tab

console.log() in client-side JavaScript

Difference between client-side logs and server-side logs

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:

Answer: D

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

userInformation is a plain JavaScript object:

{

id: " user-01 " ,

email: " user01@universalcontainers.demo " ,

age: 25

}

You can access object properties in two standard ways:

Dot notation : object.propertyName

Bracket notation : object[ ' propertyName ' ]

Apply to each option:

A. userInformation.email

Correct dot notation; accesses " user01@universalcontainers.demo " .

B. userInformation.get( " email " )

.get() is a method on Map instances, not on plain objects.

A regular object does not have a .get method; this would be TypeError.

C. userInformation[ " email " ]

Correct bracket notation; string " email " is used as the property key.

Returns " user01@universalcontainers.demo " .

D. userInformation[email]

Here email is treated as a variable, not a string literal.

Unless there is a variable named email defined with a value matching a property key, this will either:

Throw a ReferenceError (if email is not defined), or

Use the value of email as a computed key (not what is intended here).

It is not the correct way to access the " email " property literal.

Therefore, the correct ways are:

Answer: A, C

Relevant concepts: object property access (. vs []), plain objects vs Map, literal property names vs computed property names.