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Vincent Cotro
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140 questions
Medium
109 votes4191 runs
6 comments

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

Web developer
Vincent Cotroat Jan 18, 2024
Easy
49 votes3427 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
48 votes3838 runs4 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
40 votes2082 runs1 comment

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

Back-end developer
recursion
Vincent Cotroat Mar 28, 2023
Easy
37 votes2133 runs1 comment

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

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Easy
19 votes3379 runs0 comment

Select only distinct values in a column using SQL

Back-end developer
sql
distinct
Vincent Cotroat Mar 27, 2023
Easy
19 votes3292 runs1 comment

Update a column in an SQL table

Back-end developer
sql
update
Vincent Cotroat Nov 7, 2023
Easy
17 votes3395 runs0 comment

Write a SQL query to insert data into a table

Back-end developer
sql
insert
Vincent Cotroat Mar 27, 2023
Easy
16 votes3359 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
13 votes3325 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
13 votes1386 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
13 votes869 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
12 votes1761 runs
2 comments

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
12 votes1374 runs0 comment

Define a custom type that represents a coordinate with an x and y property of type number in Typescript

Web developer
typescript
type
Vincent Cotroat Mar 31, 2023
Medium
11 votes4255 runs
7 comments

Print the number of countries in the array travel.

Web developer
array
for loop
Vincent Cotroat Sep 5, 2022
Easy
11 votes3305 runs0 comment

How to delete an SQL table?

Back-end developer
sql
tables
Vincent Cotroat Mar 27, 2023
Easy
11 votes3196 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
11 votes1309 runs0 comment

Typescript: What is the type of result?

Web developer
typescript
type
Vincent Cotroat Mar 29, 2023
Easy
10 votes3282 runs0 comment

Count the number of rows in an SQL table

Back-end developer
sql
count
Vincent Cotroat Mar 27, 2023
Easy
10 votes2272 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