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Re:Ask HN: Best ways to brush up JavaScript knowledge by gpa on Sunday August 06, 2023 @10:25AM (#37022295)
Perhaps this MDN article, which used to be called "A re-introduction to JavaScript" and is now called "JavaScript language overview": https://developer.mozilla.org/en-US/docs/Web/JavaScript/Lang...

Also, if you search for "A re-introduction to JavaScript" in HN Search, you will find previous posts of the same article with comments pointing to other similar sources.

The book Eloquent JavaScript is also available online, but is longer: https://eloquentjavascript.net/

Re:Ask HN: Best ways to brush up JavaScript knowledge by AlexITC on Sunday August 06, 2023 @12:53PM (#37023948)
For some reason the link isn't complete, this one worked for me: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Lang...