Online Access Free JavaScript-Developer-I Exam Questions

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No.# Correct Answers
A. Executes server-side JavaScript code to avoid learning a new language.

Benefit: Since the team has already built the website using HTML, CSS, and JavaScript, using Node.js allows developers to write both client-side and server-side code in JavaScript. This unification can improve productivity, reduce context switching, and streamline the development process by allowing developers to work with a single language across the entire stack.
B. Uses non-blocking functionality for performant request handling.

Benefit: Node.js uses an event-driven, non-blocking I/O model, which makes it highly efficient and scalable, especially for handling multiple requests concurrently. This makes Node.js particularly suitable for I/O-bound tasks like serving APIs, where fast response times and the ability to handle many connections simultaneously are critical.
D. Installs with its own package manager to install and manage third-party libraries.

Benefit: Node.js comes with npm (Node Package Manager), which is the largest ecosystem of open-source libraries. npm allows developers to easily install, update, and manage third-party packages, which can significantly speed up development by allowing the team to leverage existing modules and tools rather than building everything from scratch.
Explanation of Incorrect Options
C. Performs a static analysis on code before execution to look for runtime errors.

Incorrect: Node.js does not perform static analysis on code before execution. Static analysis is typically done using separate tools like ESLint or TypeScript. Node.js directly interprets and executes JavaScript code.
E. Ensures stability with one maj...

No.# Correct Answers
A. let strValue = String(numValue);

The String function converts the number to a string.
D. let strValue = numValue.toString();

The toString method of the number object converts the number to a string.
E. let strValue = (String)numValue;

This uses the String function in a slightly different syntax, but it still converts the number to a string.
Explanation of Incorrect Options
B. let strValue = * * 4 numValue;

This syntax is incorrect and will result in a syntax error. The * * operator does not exist in JavaScript.
C. let strValue = numValue.toText();

There is no toText method for number objects in JavaScript. The correct method is toString.

No.# Option B is corect.
find the missing question part below:
flag();
anotherPing();
function flag()
{
console.log("flag");
}
const anotherPing=()=>{
console.log("another flag");
}



The flag function is declared using a function declaration, which is hoisted to the top of the scope. This means that the flag function can be called before its declaration in the code.

The anotherPing function is declared using a const variable with an arrow function. Variable declarations with const (and let) are hoisted to the top of the scope but are not initialized. This means the variable anotherPing exists in the scope but cannot be used until the line of code where it is assigned a value.

No.# None of the option are correct .
Above question get error on line no 5 when it calling 'saleltem.currprice()'.

No.# Correct answer is Option B, C.

C. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.

This is a unique feature of arrow functions. If the body of the function consists of a single expression, you can omit the curly braces and the return keyword, and the expression will be implicitly returned.

B. The function uses the this from the enclosing scope.

Arrow functions do not have their own this context. Instead, they lexically inherit this from the surrounding code at the time they are defined, which means they use the this value from their enclosing scope. This makes arrow functions particularly useful for preserving the this context in situations like method definitions or callback functions.

No.# The correct global variable to use in a Node.js script to get the folder location from which the code executes is:

A. __dirname

The __dirname global variable contains the directory name of the current module, which is essentially the folder where the script is located. This is useful for constructing paths relative to the location of the script.

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No.# userInformation["email"]

No.# Tried by executing the code and answer is 11
It runs synchronous lines first and adds async methods like settimeout/setinterval functions in queue even if time is 0... so it will print 11 first and then add in the value

Try on your own aswell:
let total = 10;
const interval = setInterval(()=>{
total++;
clearInterval(interval);
total++;
},0);
total++;
console.log(total);

No.# A. View and change the DOM of the page:

Developers can inspect and manipulate the HTML structure of the page using JavaScript commands in the console. This includes selecting elements, modifying their attributes, and even adding or removing elements.
C. View, change, and debug the JavaScript code of the page:

The console allows developers to log messages, debug JavaScript code by setting breakpoints, stepping through code execution, and inspecting variables and objects. This is crucial for diagnosing and fixing issues in JavaScript applications.
D. Display a report showing the performance of a page:

Modern browsers provide performance monitoring tools accessible through the console. Developers can analyze page load times, network requests, memory usage, and other performance metrics using commands and reports available in the console.

No.# B, C is correct
const sum3 = (arr) => {return arr[0]+arr[1]}
console.assert(sum3([1,4,1])===6)
console.assert(sum3([1,5,1])===6)

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No.# Should be 12.

The variable total is initialized to 10.
setInterval is called with a callback function that increments total and then immediately clears the interval.
total is incremented once outside of the setInterval.
The console.log(total) statement outputs the value of total.
Here's the breakdown of the execution steps:

Initial value of total: 10
Inside the setInterval callback:
Increment total: 11
Clear the interval
Increment total outside the setInterval: 12
Output the value of total using console.log: 12
The key here is that even though the interval callback is triggered immediately, it does not interrupt the execution of subsequent code. Therefore, the total variable is incremented to 11 inside the interval callback, but then it's immediately cleared. The subsequent increment outside the interval is not affected by the interval callback because it occurs after the interval is cleared.