Learn and train JavaScript
with articles with questions and a big quiz with questions from the articles
Latest articles
JavaScript noop
Learn what the noop function does and why you'd want to use it. Includes quiz at the end.
Swap variables in JavaScript: 2 ways to do it
Learn how to swap variables in JavaScript in two different ways. Includes quiz at the end.
JSON data types
Learn about the possible data types we can and cannot use in JSON. Includes quiz at the end.
JavaScript three dots (...) in depth
Learn about the spread operator and rest parameters. Then test what you learned.
The small joys of doing open source
Why even doing minor contributions to open source can be very satisfying.
JavaScript typeof
Learn how the operator typeof works.Then test what you learned with interview questions.
JavaScript multiple assignment
Learn how a = b = 2 works in JavaScript. Then test what you learned with interview questions.
Boolean function in JavaScript
Learn how the Boolean function works in JavaScript. Then test what you learned with interview questions.
JavaScript double bang !! (double negation)
Learn how !! works in JavaScript. Then test what you learned with interview questions.
Truthy values in JavaScript
Learn what are truthy values in JavaScript. Test what you learned with interview questions.