JavaScript, Node.js, and SQL Online Test
TestDome skill assessments are used by more than 3,700 companies and 450,000 individual test takers.
Jobseekers: Get a Certificate
Take a Practice TestCompanies: Try First, Pay Later
Sign Up To Use This Test Used by:
The JavaScript, Node.js, and SQL online test assesses candidates' knowledge of programming in the JavaScript language, specific Node.js features, and their ability to use SQL.
It's an ideal test for pre-employment screening. A good Node.js developer needs to be able not only to solve problems using Node.js but also to write and analyze SQL queries to access a database.
This online test requires candidates to solve coding problems in JavaScript, to answer multiple-choice and fill in the blanks questions about Node.js, and to write SQL queries that extract, combine, and manipulate data.
Recommended Job Roles
Back-End Developer
JavaScript Developer
Node.js Developer
SQL Developer
Sample Candidate Report
Sample Free Questions
Config
3min
-
Easy
-
MCA
Node.js
NPM
Public
New
Node.js
Node.js is a cross-platform JavaScript runtime environment for developing a diverse variety of tools and applications. It is used primarily as the back end for web applications(including the MEAN stack).
NPM
npm is the default package manager for Node.js. As such, it is an important tool for every Node.js developer.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
New
This is a part of latest question addition to our question library.
Consider the following package.json for a Node.js application:
{
"name": "skill-measure-app",
"private": true,
"version": "1.0.0",
"main": "lib/main.js",
"scripts": {
"build": "npm run cleanup & npm run test & npm run publish",
"cleanup": "rm -fr ./lib",
"test": "jest",
"publish": "npm publish lib"
},
"dependencies": {
"jest": "^23.0.1",
"custom-package": "file:../custom-package"
}
}
Select all the correct statements.
(multiple correct answers possible)
Ensure
3min
-
Easy
Easy
-
CODE
JavaScript
Language
Public
JavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
Implement the ensure function so that it throws an error if called without arguments or the argument is undefined. Otherwise it should return the given value.
Students
3min
-
Easy
Easy
-
CODE
SQL
Aggregation
Public
SQL
SQL is the dominant technology for accessing application data. It is increasingly becoming a performance bottleneck when it comes to scalability. Given its dominance, SQL is a crucial skill for all engineers.
Aggregation
An aggregate function is typically used in database queries to group together multiple rows to form a single value of meaningful data. A good programmer should be skilled at using data aggregation functions when interacting with databases.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
Given the following data definition, write a query that returns the number of students whose first name is John.
TABLE students id INTEGER PRIMARY KEY, firstName VARCHAR(30) NOT NULL, lastName VARCHAR(30) NOT NULL
Premium Questions
The premium question library contains our unique, hand-crafted questions. We offer a refund if you find any of them answered online.
Questions
Filter, Stopwatch, Movies, Index Performance, Poll, Rectangles, Height, Positive Numbers, Retirees, Authors, Countries, Employee Manager, Merge Stock Index, Paragraph, Post Comment, Row Appender, Validation, Hobbies, Cheapest Product, Vectors, Username, Function Wrapper, Anchors, Confirm, Movies Live, Double, Reorder, Hide Button, Truthy Expressions, Array Search, ATM Locations, Autocomplete, Department Report, Developers, Ingredients, Loading Bar, Delete Orders, Product Rating, Products, Restaurant Menu, Roads, Sales, Snapshot, Student Activities, Table of Names, Transactions, Word Count, Projects, Log Parser, Date Transform, Cards, Youngest Child, SMS Messages, Scale Font Size, Bank Branches, Hospital Patients, New Folder, Screen, Log Patch, Ban Users, Menu Items, Segment, Shopping Cart, Read Files, Weather Data, Fahrenheit Converter, TasksSkills
JavaScriptJavaScript
JavaScript is the programming language of HTML and the web. It's an essential skill for any programmer working with websites and web technologies.
Arrays
An array is a container of a fixed number of objects of a similar type. It is a fundamental component of most programming languages.
Closures
Closures are an important concept in any programming language in which functions are first-class citizens.
SQL
SQL is the dominant technology for accessing application data. It is increasingly becoming a performance bottleneck when it comes to scalability. Given its dominance, SQL is a crucial skill for all engineers.
Aggregation
An aggregate function is typically used in database queries to group together multiple rows to form a single value of meaningful data. A good programmer should be skilled at using data aggregation functions when interacting with databases.
Subqueries
Subqueries are commonly used in database interactions, making it important for a programmer to be skilled at writing them.
Indexes
The proper implementation and use of indexes are important for improving the performance of database queries.
Conditions
Conditional statements are a feature of most programming and query languages. They allow the programmer to control what computations are carried out based on a Boolean condition.
Arithmetic
Arithmetic is a fundamental branch of mathematics. An understanding of arithmetic concepts, and their application, is important for every candidate.
Language
A programmer should use a language as a tool, always taking advantage of language-specific data types and built-in functions.
Insertion
Even though most database insert queries are simple, a good programmer should know how to handle more complicated situations like batch inserts.
Joins
A normalized database is normally made up of multiple tables. Joins are, therefore, required to query across multiple tables.
Union
In mathematics, a union typically involves testing if an element exists in two or more sets. This definition also applies as an operator and function in various programming languages. As one of the most common collection operations, alongside intersection, it's an important topic for any candidate to understand.
Strings
The string data structure is used to represent text. It is one of the most commonly used data structures. Therefore, every programmer should be skilled at string manipulation.
DOM manipulation
Dynamically accessing and updating user interface elements is an important part of most modern web applications.
Event handling
Event-based design patterns are very common in modern applications, especially in the development of user interfaces.
Iteration
Iteration is the act of repeating a process, or cycling through a collection. Iteration is one of the fundamental flow control tools available to developers.
Searching
Every programmer should be familiar with data-searching methods, as they are very common in data-analysis processes.
Exceptions
Exceptions exist in most modern programming languages, making it important for a programmer to understand them and know how to handle them.
Recursion
A good programmer should be familiar with when to use recursive functions, since they can provide elegant solutions for complex problems.
Constraints
Constraints are used to define rules and relationships. They are applied to a dataset. A constraint may take many forms, such as x ≤ 5 in a programming language and a NOT NULL constraint in a SQL table definition.
Database Schema
A database schema defines how data is stored in a database. An SQL database uses a schema to define tables consisting of rows and columns that use fixed data types to store data. Formalizing how data is stored is the first step towards building an application or service.
Performance tuning
The performance of an application or system is important. The responsiveness and scalability of an application are all related to how performant an application is. Each algorithm and query can have a large positive or negative effect on the whole system.
Bug fixing
Everyone makes mistakes. A good programmer should be able to find and fix a bug in their or someone else's code.
Update
The UPDATE statement is used to modify the existing records in a table and is one of the most used operations for working with the database.
HTML5
HTML5 is now supported in all modern browsers, making it important for front-end developers to know how to use its features.
Delete
The delete statement is used to delete records in a table and is one of the four basic CRUD functions (create, read, update, and delete) required for working with any persistent storage.
Serialization
Familiarity with data serialization to and from formats such as XML and JSON is important as it is commonly used for interprocess communication
Sorting
Every programmer should be familiar with data-sorting methods, as sorting is very common in data-analysis processes.
Views
A database view is a result set that is defined by a stored query, the results of which can can also be queried. As a fundamental and widely used database construct, it's useful for candidates to understand how and when they should be used.
Styling
Styling user interfaces according to the specification is a daily routine for a front-end developer.
Classes
A class is one of the most widely used and primary structures used in object-oriented programming. As such it's important for any developer to have a working knowledge of how to use it.
ECMAScript 2015
ECMAScript 2015 adds a significant number of features to JavaScript, including classes, modules and range based loops. As such it's important for any JavaScript developer to understand.
Monkey Patching
Monkey Patching is a method of either adding new or overriding existing functionality without the creation of a new type. As such it's an important tool for developers to be familiar with.
Node.js
Node.js is a cross-platform JavaScript runtime environment for developing a diverse variety of tools and applications. It is used primarily as the back end for web applications(including the MEAN stack).
Events
Events are the basic building block of Node.js. As such, they are important for all Node.js programmers.
Asynchronous Programming
Asynchronous programming is a programming method used to to run tasks asynchronously. Running tasks asynchronously can improve performance and allow applications to feel more responsive. As such, it's important for all programmers who need to write performant or responsive applications.
Modules
In Node.js, modules are a way to package applications into multiple pieces. As such, it's important for every developer to know how they work.
Score Distribution
Loading...
Fully Customizable Tests
Add questions from our question library.
Create your own questions.
Customize test duration, number of questions, passing score, web proctoring, and more.
What Others Say
Simple, straight-forward technical testing
TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.
Jan Opperman, Grindrod Bank
Very smooth, well supported, great for assessing candidates
Very Prompt and helpful support when needed, we were looking to work with a third party to write and set up new tests, TestDome was able to quickly set up and support a method to do this, allowing us to start testing candidates straight away.
George Offer, Guided Solutions
Easy to use and efficient for testing developers of different levels
It provides us an opportunity to set our own timing policy, to choose from variety of questions from different areas and with difficulty gradation. Also it is great that TestDome provides free of charge tests for candidates to prepare and check how online IDE works. And support is always ready to help:)
Alexandra Bulka, WorkFusion
On the TestDome Blog
Screening Applicants: The Good, the Bad and the Ugly
Since we’re all biased and we use incorrect proxies, why not just outsource hiring to experts or recruitment agencies? After all, they’ve been screening people for many years, so they must know how to do it right?
Not really. I was surprised to discover that many experts disagree with each other. Everybody praises their pet method and criticizes the others. Many of these methods look legitimate, but are based on...
How TestDome Works
The TestDome Advantage
500+ premium, hand-crafted questions for 30+ job skills and 10+ coding languages.
Proctored tests, API access, and Applicant Tracking System (ATS) Integration.
Questions with small samples of actual work instead of academic problems.
Flexible Pricing
No monthly subscription or setup fee. No minimum contract period. You only pay for the candidates you test.
View PricingNot exactly what you're looking for?
Related Programming Tests:
