How can I split a JavaScript array into two groups?
Learn how to split a JavaScript array into two groups based on a function or an array of values.
Code Articles
30 seconds of code contains a curated collection of code articles covering a wide range of development needs. The collection spans many topics, ranging from simple coding problems to theoretical concepts and development techniques.
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JavaScript · -
JavaScript · Find the head and tail of an array in JavaScript
Find the head or tail of a JavaScript array without mutating it.
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JavaScript · Calculate SHA-256 hash in JavaScript
Calculate a SHA-256 hash in JavaScript using native APIs in both the browser and Node.js.
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JavaScript · How can I check if a number is even or odd using JavaScript?
Check if a number is even or odd using JavaScript using the modulo operator or bitwise AND operator.
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JavaScript · Get the first or last n elements in a JavaScript array
Learn how to retrieve the first or last
nelements in a JavaScript array with a single line of code. -
JavaScript · What is hoisting in JavaScript?
Hoisting comes up a lot during JavaScript interviews. It's a concept that may require some getting used to, so read our guide to learn more.
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JavaScript · Convert between degrees and radians in JavaScript
Easily apply the degree to radian and radian to degree formulas.
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JavaScript · Introduction to Semantic Versioning (SemVer)
Learn how semantic versioning works and how to use it to correctly version your software.
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JavaScript · Get N elements from the start or end of a JavaScript array
Learn how to get the first or last N elements of a JavaScript array, using
Array.prototype.slice(). -
HTML · What is the difference between alt and title?
Learn the difference between the
altandtitleattributes on images in HTML. -
HTML · What is the purpose of the alt attribute on images?
Learn how to correctly use the
altattribute on images in HTML. -
JavaScript · The many ways to initialize a JavaScript Array
Discover the inner workings of JavaScript arrays and learn about the different ways to initialize them.
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CSS · CSS Print Stylesheet
A short opinionated print stylesheet to make your websites look great on paper.
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Web development · Beware of Bad Programming Advice - Spotting Senior Juniorism
Don't fall victim to bad advice! Learn to identify "senior juniorism", and develop critical thinking to make better coding decisions.
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Git · Git Basics - Push and pull changes between local and remote
Learn how to push and pull changes between local and remote repositories.
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JavaScript · Chaining dynamic getters using the Proxy object
Using the Proxy object, we can create chainable dynamic getters for objects in JavaScript.
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Git · Undo a commit in Git
Learn the simple way to undo a commit in Git without rewriting history.
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Git · Merge a branch in Git
Learn how to merge a branch in Git with or without creating a merge commit, depending on your team's workflow.
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Git · Rewind back to a specific commit in Git
Did you make a mistake but haven't pushed your changes yet? Learn how to rewind back to a specific commit in Git.
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Git · Find branches containing a specific Git commit
Learn how to filter branches based on whether they contain a specific commit or not.
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Git · Create a commit by a different author in Git
Ever wanted to commit as someone else? Maybe change the author of an existing commit? Here's how.
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Git · View a short summary of Git commits
Learn how to view a short summary of your Git commits using git log.
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Git · Change the last commit's message or contents in Git
Learn how to effortlessly amend the last commit's message or contents using Git and fix any mistakes you might have made.
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CSS · How do you review CSS code in Pull Requests?
Reviewing CSS code is a skill that takes time to master. Here are some tips from my personal experience to help you get started.