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Vincent Cotro
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143 questions
Medium
71 votes2946 runs4 comments

Understanding the differences between `map()` and `forEach()` methods in JavaScript

Web developer
Vincent Cotroat Jan 18, 2024
Easy
33 votes2422 runs0 comment

Write a SQL query to retrieve the list of employees with a salary greater than 5100.

Back-end developer
sql
select
where
Vincent Cotroat Mar 30, 2023
Medium
31 votes2708 runs3 comments

Write a JavaScript function that fetches data from an API and logs it to the console.

Web developer
promises
async
Vincent Cotroat Mar 28, 2023
Easy
30 votes1410 runs1 comment

Write a Python function that returns the factorial of a number.

Back-end developer
recursion
Vincent Cotroat Mar 28, 2023
Easy
24 votes1521 runs1 comment

Explain the difference between the `include` and `require` functions in PHP.

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Easy
15 votes2389 runs0 comment

Select only distinct values in a column using SQL

Back-end developer
sql
distinct
Vincent Cotroat Mar 27, 2023
Easy
15 votes2332 runs1 comment

Update a column in an SQL table

Back-end developer
sql
update
Vincent Cotroat Nov 7, 2023
Easy
12 votes2400 runs0 comment

Write a SQL query to insert data into a table

Back-end developer
sql
insert
Vincent Cotroat Mar 27, 2023
Easy
12 votes2376 runs0 comment

Which SQL keyword is used to sort the result of a SELECT statement?

Back-end developer
sql
order by
Vincent Cotroat Mar 27, 2023
Medium
10 votes2339 runs4 comments

Write the SQL query to delete a column from a table

Back-end developer
sql
table
column
Vincent Cotroat Mar 27, 2023
Easy
10 votes2275 runs0 comment

Write a SQL query to retrieve the products with a price less than 1000 and sort the results in descending order of price.

Back-end developer
sql
order by
descending
Vincent Cotroat Mar 28, 2023
Easy
9 votes1065 runs1 comment

Write a SQL query to retrieve the titles of books written by 'John Smith'.

Back-end developer
join
inner join
sql
Vincent Cotroat Sep 6, 2023
Easy
8 votes1523 runs0 comment

Write a React component that updates the document title with each click and resets to 'React App' when the component unmounts.

Web developer
react
hooks
useState
Vincent Cotroat Apr 5, 2023
Easy
8 votes967 runs0 comment

Which of the following utility types makes all properties of a given type optional?

Web developer
typescript
types
Vincent Cotroat Mar 29, 2023
Medium
8 votes523 runs0 comment

What is the best practice to apply in your code to improve the performance of your application?

Back-end developer
performance
gzip
Vincent Cotroat Nov 15, 2023
Easy
7 votes2361 runs0 comment

How to delete an SQL table?

Back-end developer
sql
tables
Vincent Cotroat Mar 27, 2023
Easy
7 votes794 runs2 comments

What is the size of a long long in C++?

IT Architect
c++
memory
Vincent Cotroat Nov 3, 2023
Medium
6 votes3188 runs2 comments

Print the number of countries in the array travel.

Web developer
array
for loop
Vincent Cotroat Sep 5, 2022
Easy
6 votes2339 runs
5 comments

Write a SQL query to retrieve the names of students enrolled in the course with ID 1.

Back-end developer
join
inner join
sql
Vincent Cotroat Mar 28, 2023
Easy
6 votes2260 runs0 comment

Write a SQL query to calculate the total quantities sold for each product_id.

Back-end developer
sql
sum
group by
Vincent Cotroat Mar 28, 2023