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| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - try-catch blocks - Logging strategies and debugging techniques |
| Browser and Events | 17% | - Event handling, propagation, bubbling, and capturing - DOM manipulation - Browser Developer Tools |
| Testing | 7% | - Automated testing strategies - Test-driven development principles - Unit testing with Jest |
| Server Side JavaScript | 8% | - Salesforce API integration - Node.js applications - Modules and file operations |
| Objects, Functions, and Classes | 25% | - ES6 Classes, constructors, methods, and inheritance - Object creation, properties, and prototypal inheritance - JavaScript modules (export, import) - Function declarations, expressions, and arrow functions - Higher-order functions and closures |
| Variables, Types, and Collections | 23% | - Type coercion and type conversion - Variable declaration (var, let, const, scoping, hoisting) - Array manipulation (map, filter, reduce, forEach, find) - JSON parsing and stringification - String manipulation and Date objects |
| Asynchronous Programming | 13% | - Promises and async/await - Event loop and asynchronous code execution - Callback patterns |
>> JS-Dev-101 Fragen&Antworten <<
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27. Frage
Given the JavaScript below:
function onLoad() {
console.log("Page has loaded!");
}
Where can the developer see the log statement after loading the page in the browser?
Antwort: C
Begründung:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
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:
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
________________________________________
28. Frage
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
Antwort: D
Begründung:
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
29. Frage
Refer to the following code:
<html lang="en">
<body>
<button class="secondary">Save draft</button>
<button class="primary">Save and close</button>
</body>
<script>
function displaySaveMessage(event) {
console.log('Save message.');
}
function displaySuccessMessage(event) {
console.log('Success message.');
}
window.onload = function() {
document.querySelector('.secondary')
.addEventListener('click', displaySaveMessage, true);
document.querySelector('.primary')
.addEventListener('click', displaySuccessMessage, true);
}
</script>
</html>
Antwort: D
Begründung:
The answer choices appear to belong to an event propagation question using nested elements such as an outer element and an inner element.
The important clue is this third argument:
addEventListener('click', handlerFunction, true);
When the third argument is true, the event listener runs during the capturing phase.
In event capturing, the browser handles the event from the outside toward the inside:
Outer element → Inner element
So, if an inner element is clicked and both the outer and inner elements have click listeners registered with capture mode set to true, the outer listener runs first, then the inner listener runs.
That produces:
Outer message
Inner message
So the matching option is B.
Important correction:
In the exact code shown, the buttons are sibling elements:
<button class="secondary">Save draft</button>
<button class="primary">Save and close</button>
They are not nested inside one another. Therefore, with the code exactly as written:
Clicking the secondary button logs:
Save message.
Clicking the primary button logs:
Success message.
However, because the provided answer choices refer to Outer message and Inner message, the intended concept is clearly event capturing. In a capturing-phase question with nested outer and inner elements, the correct order is:
Outer message
Inner message
Therefore, the verified answer for the intended event-capturing question is B.
30. Frage
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:
01 let res = sum3([1, 2, 3]);
02 console.assert(res === 6);
03
04 res = sum3([1, 2, 3, 4]);
05 console.assert(res === 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array.
Which two results occur when running the test on the updated sum3 function?
Antwort: A,D
Begründung:
New behavior: sum3 now returns the sum of all elements.
Line 01: sum3([1, 2, 3]) → 1 + 2 + 3 = 6
Assertion on line 02: res === 6 → passes.
Line 04: sum3([1, 2, 3, 4]) → 1 + 2 + 3 + 4 = 10
Assertion on line 05: res === 6 → 10 === 6 is false, so the assertion fails.
So:
Line 02 assertion passes → D.
Line 05 assertion fails → C.
________________________________________
31. Frage
Given the HTML below:
<div>
<div id="row-uc">Universal Containers</div>
<div id="row-as">Applied Shipping</div>
<div id="row-bt">Burlington Textiles</div>
</div>
Which statement adds the priority-account CSS class to the Applied Shipping row?
Antwort: D
Begründung:
document.querySelector('#row-as') returns the single element with id row-as.
That element has a classList property with add, remove, etc.
Correct usage:
document.querySelector('#row-as').classList.add('priority-account');
Why others are wrong:
A: querySelectorAll returns a NodeList, not a single element, so it does not have a classList property.
C: DOM elements do not have a classes array or push; they have classList.
D: document.getElementById('row-as') is fine to get the element, but there is no addClass method in standard DOM; that's a jQuery-style API, not vanilla JS.
________________________________________
32. Frage
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