JAVASCRIPT-DEVELOPER-I Online Practice Questions and Answers
Referto the code below: Const pi = 3.1415326, What is the data type of pi?
A. Double
B. Number
C. Decimal
D. Float
A developer has the function, shown below, that is called when a page loads.
function onload() {
console.log("Page has loaded!");
}
Where can the developer see the log statement after loading the page in the browser?
A. Terminal running the web server.
B. Browser performance toots
C. Browser javaScript console
D. On the webpage.
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill ( items ) {
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?
A. Using the debugger commandon line 05.
B. Using the debugger command on line 03
C. Calling the console.trace (total) method on line 03.
D. Wrapping findSubtotal in a console.log() method.
Refer to the following code:
What isthe value of output on line 11?
A. [1, 2]
B. [`'foo'', `'bar'']
C. [`'foo'':1, `'bar'':2'']
D. An error will occur due to the incorrect usage of the for...of statement on line 07.
GIven a value, which three options can a developer use to detect if the value is NaN? Choose 3 answers !
A. value == NaN
B. Object.is(value, NaN)
C. value === Number.NaN
D. value ! == value
E. Number.isNaN(value)
Refer to the following code:
What will the console show when the button is clicked?
A. Outer message
B. Outer message Inner message
C. Inner message Outer message
D. Inner message
A developer wants to set up a secure web serverwith Node.js. The developer creates a directory locally called app-server, and the first file is app-server/index.js Without using any third-party libraries, what should the developer add to index.js to create the secure web server?
A. const https =require(`https');
B. const server =require(`secure-server');
C. const tls = require(`tls');
D. const http =require(`http');
Given the code below:
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
A. console.group(usersList) ;
B. console.table(usersList) ;
C. console.info(usersList) ;
D. console.groupCol lapsed(usersList) ;
Given the code below: What is logged to the console'
A. 1 2 3 4 5
B. 1 2 5 3 4
C. 2 5 1 3 4
D. 2 5 3 4 1
A developer wants to use a module called DataPrettyPrint. This module exports one default function called printDate (). How can a developer import and use the printDate() function?
A. Option A
B. Option B
C. Option C
D. Option D