DEV Community

Awesome JavaScript hacks

Mitchell Mutandah on December 21, 2022

In this post I will share useful hacks for JavaScript. These hacks reduce the code and will help you to run optimized code. So let’s start hacking!...

Read full post

Jon Randy 🎖️ • Dec 22 '22 • Edited

A few things:

None of these are 'hacks' - they're just features of the language
Your typeof example is missing typeof - oops! 😝
Your shuffling example will give biased results (some shuffle permutations will turn up way more often than others - explanation here)
Your method for testing if an object has values is overly simplistic, and may result in you deleting objects that are, in fact, not empty. It will not include keys that are Symbols, string keys that are non-enumerable, and values coming from lower down in the prototype chain. For more information on this, you can look here
You can add syntax highlighting to your examples by adding js after the opening three backticks of the code block

Wade Zimmerman • Dec 23 '22

Came here to say the same thing. "Hacks" are more of a thing for working around libraries/frameworks. Like using reflection to access a private property or something. Better title would have been something like "My favorite pieces of code"

Mitchell Mutandah • Dec 22 '22

Thank you Jon Randy for highlighting some crucial points. I have updated the typeof function. There is more to learn. Thanks again for the useful links.

Jon Randy 🎖️ • Dec 23 '22 • Edited

Might want to update it again, since typeof is an operator, not a function (as you initially correctly state) - and the data you are checking is the operand, not an argument to a function. For this reason, the parentheses in your example are unnecessary.

pilcrowOnPaper • Dec 23 '22

Please don't use && as a shortcut for conditional statements. It is harder to read and understand. You may want to use ?? instead of || if you just want to check if the value is undefined or null.

Jon Randy 🎖️ • Dec 23 '22

Readability and understand-ability are purely subjective.

Mahmudul Hasan • Dec 22 '22 • Edited

Good post, learn this things. Please share more!

Mitchell Mutandah • Dec 22 '22

Thank you.

fruntend • Dec 26 '22

Сongratulations 🥳! Your article hit the top posts for the week - dev.to/fruntend/top-10-posts-for-f...
Keep it up 👍

Ethan • Dec 26 '22

Why did you only mention console.table when there are many other methods for the console like console.group, console.error, console.warn` and many other super useful methods on the console object?

Amir.H Ebrahimi • Dec 25 '22

Noteing something for readers, as article said typeof is an operator not a function

so it can also be used like an operator without prantesis.

const isSSR = () => typeof window === 'undefiend';

value wrapped with prantesis is going to be evaluated to variable iteself.

Mitchell Mutandah • Dec 28 '22

Thanks, updated.

Paweł Ciosek • Dec 23 '22

Thanks!

Dilan Udawattha • Dec 24 '22

Wow!, Good to know

Ianeta Hutchinson • Dec 24 '22 • Edited

We could break this down into bite sized bits for other sharing formats