Corrections to the article "10 JavaScript Hacks Every Web Developer Should Know"

several corrections to the article at https://www.freecodecamp.org/news/javascript-hacks/

x-post from FCC forum, as per support-reply

1.

math.round(math.random*50)

Uncaught ReferenceError: math is not defined

the keyword is Math, first letter is upper-cased and its method is .random(), with brackets at the end

2.

equating Math.round to ~~

// instead of
math.round(math.random*50)
// use
~~(math.random*50)

~~ acts the same as Math.floor, since its “~” twice – bitwise inversion two times, decimal part just falls off, as it can only be apllied to integer numbers, and floats are converted on first inversion

3.

You can also use filter() together with Boolean to return all null or undefined values from your array.

no, its literally the opposite. only truthy elements will be returned.

[AbbeyRenn]

Thank you @dym-sh @RandellDawson @scissorsneedfoodtoo I’ve emailed the author so he can make the remaining corrections 👍

[scissorsneedfoodtoo]

The author made some updates and I worked on some additional formatting and wording issues.

Thanks for reporting this @dym-sh. Please let us know if you notice anything else in this or other articles.