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139 questions
Medium
119 votes4680 runs
6 comments

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

Web developer
Anonymous authorat Jan 18, 2024
Easy
55 votes3796 runs0 comment

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

Back-end developer
sql
select
where
Anonymous authorat Mar 30, 2023
Medium
50 votes4291 runs4 comments

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

Web developer
promises
async
Anonymous authorat Mar 28, 2023
Easy
44 votes2306 runs1 comment

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

Back-end developer
recursion
Anonymous authorat Mar 28, 2023
Easy
39 votes2364 runs1 comment

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

Back-end developer
functions
errors
Anonymous authorat Mar 24, 2023
Easy
21 votes3758 runs0 comment

Write a SQL query to insert data into a table

Back-end developer
sql
insert
Anonymous authorat Mar 27, 2023
Easy
21 votes3744 runs0 comment

Select only distinct values in a column using SQL

Back-end developer
sql
distinct
Anonymous authorat Mar 27, 2023
Easy
19 votes3647 runs1 comment

Update a column in an SQL table

Back-end developer
sql
update
Anonymous authorat Nov 7, 2023
Easy
17 votes3719 runs0 comment

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

Back-end developer
sql
order by
Anonymous authorat Mar 27, 2023
Easy
16 votes1012 runs0 comment

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

Back-end developer
performance
gzip
Anonymous authorat Nov 15, 2023
Medium
14 votes3687 runs4 comments

Write the SQL query to delete a column from a table

Back-end developer
sql
table
column
Anonymous authorat Mar 27, 2023
Easy
14 votes1527 runs0 comment

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

Web developer
typescript
types
Anonymous authorat Mar 29, 2023
Medium
13 votes4669 runs
7 comments

Print the number of countries in the array travel.

Web developer
array
for loop
Anonymous authorat Sep 5, 2022
Easy
13 votes1515 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
Anonymous authorat Mar 31, 2023
Easy
11 votes3655 runs0 comment

How to delete an SQL table?

Back-end developer
sql
tables
Anonymous authorat Mar 27, 2023
Easy
11 votes3634 runs0 comment

Count the number of rows in an SQL table

Back-end developer
sql
count
Anonymous authorat Mar 27, 2023
Easy
11 votes3543 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
Anonymous authorat Mar 28, 2023
Easy
11 votes1446 runs0 comment

Typescript: What is the type of result?

Web developer
typescript
type
Anonymous authorat Mar 29, 2023
Easy
10 votes3543 runs
2 comments

Write a SQL query to increase the salary of all employees by 10%.

Back-end developer
sql
update
salary
Anonymous authorat Mar 28, 2023
Easy
10 votes2507 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
Anonymous authorat Apr 5, 2023