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| Section | Weight | Objectives |
|---|---|---|
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices - Console methods and logging |
| Asynchronous Programming | 13% | - Async/await syntax - Promises and chaining - Callbacks and callback hell - Fetch API and HTTP requests - Event loop and micro/macro tasks |
| Variables, Types, and Collections | 23% | - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Variable declaration and initialization - Truthy and falsy values - Array methods and data manipulation - JSON parsing and usage |
| Server-Side JavaScript | 8% | - Core Node.js modules - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime |
| Testing | 7% | - Unit testing concepts - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks |
| Browsers and Events | 17% | - Document Object Model (DOM) manipulation - Script loading and execution order - Window and document object properties - Browser APIs and Web Storage - Event handling, propagation, and delegation |
| Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Object creation, properties, and methods - Class syntax, inheritance, and prototypes - Modules and imports/exports - Closures and execution context - Function definitions, parameters, and scope |
>> JavaScript-Developer-I Exam Exercise <<
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NEW QUESTION # 88
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?
Answer: C
NEW QUESTION # 89
developer removes the HTML class attribute from the checkout button, so now it is simply:
<button>Checkout</button>.
There is a test to verify the existence of the checkout button, however it looks for a button with class= "blue". The test fails because no such button is found.
Which type of test category describes this test?
Answer: C
NEW QUESTION # 90
Refer to the code below:
Let textValue = '1984';
Which code assignment shows a correct way to convert this string to an integer?
Answer: B
NEW QUESTION # 91
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?
Answer: D
NEW QUESTION # 92
Refer tothe code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line02 to achieve this?
Choose 2 answers
Answer: B,D
NEW QUESTION # 93
......
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