Quick Coding Facts

Joanna

Got 30 seconds? Great — that’s all you need to learn something new!

Keep Only What You Need with .filter()

You can use .filter() to instantly remove unwanted items from an array while keeping the original array unchanged.

const positives = numbers.filter(n => n > 0);

.filter() returns a new array – perfect for cleanup, searches, and simple validations.

Did you know?

JavaScript

#Tip 017

Level Up Your Arrays with .map()

You can use .map() to instantly transform every item in an array into something new — without mutating the original one.

const labels = numbers.map(n => `Item: ${n}`);

.map() always returns a new array, making transformations clean and predictable.

Did you know?

JavaScript

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Recovering a Deleted Git Branch

Did you know you can recover a deleted Git branch?

If you accidentally deleted a local branch, you can bring it back!

git reflog

Find the commit hash where your branch last pointed, then run:

git checkout -b <branch-name> <commit-hash>

Tip: git reflog keeps a record of all recent branch movements – even deleted ones!

Did you know?

Git

#Tip 015

GIT: See who changed a specific line

Want to know who last modified a line in a file?

git blame <file>

Perfect for tracking down when and why a change was made.

Did you know?

Git

#Tip 014

View your commit history as a graph

Make your commit history visual and easier to follow:

git log --oneline --graph --decorate --all

This command gives you a clean, visual tree of your branches and commits.

Did you know?

Git

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GIT: Stash uncommitted changes

Need to switch branches but don’t want to commit yet? This command temporarily saves your work for later:

git stash

Now you can restore your code to the exact state it was in before you stashed it, ready to continue working seamlessly.

git stash pop

Did you know?

Git

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The Difference Between == and === in JavaScript

The loose equality operator == in JavaScript automatically converts values to the same type before comparing them.
This can cause unexpected results, so it’s usually better to use the strict equality operator ===

console.log(5 == "5");   
// true - because "5" is converted to a number

console.log(5 === "5");  
// false - because types are different (number vs string)

Did you know?

JavaScript

#Tip 011

Boost Scroll Performance with passive: true

Make scroll or touch listeners more performant – tell the browser you won’t call preventDefault()

window.addEventListener(
  'scroll',
  onScroll,
  { passive: true }
);

Did you know?

JavaScript

#Tip 010

This collection of programming coding tips is a quick and easy way to learn something new – perfect for busy developers. No long explanations, no boring theory — just short, useful info in a “Did you know…” style.

You’ll find both basic things every programmer should know (at least in theory – but let’s be honest, our memory isn’t perfect and we often need Google or AI), and some funny or surprising facts that even experienced devs will enjoy.

Whether you’re just starting out, have been coding for years, or just like clicking on smart-looking stuff – there’s something here for you.

Get ready for a smile, a few “ah, now I get it!” moments, and maybe even a “good to know!”.

WARNING: Side effects may include sudden coding inspiration and a strong desire to share what you’ve learned with every developer around you.