What is TypeScript and should I learn it after JavaScript?
Lots of job posts mention TypeScript. Is it a separate language I need to learn properly, or just a small addition to JavaScript?
Programming Questions & Answers
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Core programming questions answered — languages, logic, debugging, data structures and problem-solving skills that transfer to any stack.
Discussions
How do I write a good commit message?
My commit history is full of 'fix', 'update' and 'asdf'. What does a useful commit message look like and does it actually matter?
How important is math for programming and web development?
I'm not good at maths and it's the main thing stopping me from starting. How much do I genuinely need for normal development work?
How do I switch careers into tech from a completely different field?
I'm in my thirties working in a non-technical role and want to move into tech. Is it realistic and where do I start?
How do I handle imposter syndrome when everyone seems smarter than me?
Every standup I feel like the least capable person in the room and I'm sure they'll realise soon. Does this ever fade?
What is the difference between HTML, CSS and JavaScript?
I keep hearing these three together and I'm not sure where one ends and the next begins. Can someone explain the split in plain terms with an example?
What does a technical interview at a big tech company involve?
I have an interview loop coming up at a large company and don't know what to expect across the rounds.
How do I prepare for a technical coding interview?
I have a coding interview in a month. What should I actually spend that month on to maximise my chances?
What is the difference between == and === in JavaScript?
I've been told to always use === but I don't understand what actually differs and when == would be wrong.
What is an API and how does it work, explained simply?
I've read a dozen definitions and they all say 'application programming interface' as if that clears anything up. What is an API actually doing, in normal language?
How do I choose a good project idea when I'm learning to code?
I'm told to build projects but every idea I have is either a to-do list clone or something wildly beyond my ability. How do I find the right-sized idea?
What are data structures and algorithms and do I really need them?
Self-taught developer here building working apps without ever formally studying DSA. Is it a real gap or just interview theatre?
Should I learn Python or JavaScript first?
The two most recommended first languages. I don't have a specific goal beyond 'get into tech'. How do I break the tie?
How do I fix 'undefined is not a function' and similar JavaScript errors?
I hit these constantly and my approach is basically random edits until it works. What's a systematic way to read and fix JavaScript errors?
How do I write clean code that other people can actually read?
My code works but when I come back a month later I can't follow it. What are the habits that make code readable?
What should I do if I make a serious mistake at work?
I pushed a change that broke production for two hours. I'm terrified. What's the right way to handle this?
What is Node.js and why would I use JavaScript on the server?
I understand JavaScript in the browser. What is Node actually adding, and why would anyone choose it over Python or Java for a backend?
What is Git and why does every job posting require it?
I've been building projects and just saving folders with names like project-final-v3. Every job asks for Git. What problem does it solve that folders don't?
How do I learn a new programming language quickly when I already know one?
I know JavaScript well and need to pick up Python for a project. What's the fastest sensible way when the fundamentals already exist?
Why is my CSS not working — what should I check first?
My styles just aren't applying and I've wasted an hour. Is there a standard checklist for debugging CSS that isn't showing up?