#Language

93 questions

What is the purpose of `<!DOCTYPE html>`?HTML#languageJunior
What are global attributes in HTML?HTML#languageJunior
How do anchor (`<a>`) links work, including target and rel?HTML#languageJunior
What list elements does HTML provide?HTML#languageJunior
How do you build an accessible HTML table?HTML#languageJunior
What are data-* attributes and how do you read them?HTML#languageMiddle
What do the details and summary elements provide?HTML#languageMiddle
How does the native dialog element work?HTML#languageMiddle
What are HTML entities and when do you need them?HTML#languageMiddle
How do you specify colors in CSS?CSS#languageJunior
What properties control text and fonts?CSS#languageJunior
What are CSS custom properties (variables)?CSS#languageMiddle
How do the cascade and inheritance decide which styles apply?CSS#languageMiddle
What are CSS logical properties and why do they matter for internationalization?CSS#languageSenior
What is the difference between var, let and const?JavaScript#languageJunior
What is the difference between == and === ?JavaScript#languageJunior
What are template literals?JavaScript#languageJunior
What are truthy and falsy values?JavaScript#languageJunior
What are the spread and rest operators?JavaScript#languageJunior
What is destructuring and what can it do?JavaScript#languageMiddle
What is event delegation and why use it?JavaScript#languageSenior
What are iterators and generators?JavaScript#languageSenior
What is Python and what are its key characteristics?Python#languageJunior
What are Python's built-in data types?Python#languageJunior
What are list comprehensions?Python#languageJunior
How does slicing work in Python?Python#languageJunior
How do you format strings in Python?Python#languageJunior
What is the difference between mutable and immutable objects?Python#languageJunior
How do modules, imports and packages work?Python#languageJunior
How do loops and iteration work in Python?Python#languageJunior
What are generators and the yield keyword?Python#languageMiddle
What are context managers and the with statement?Python#languageMiddle
How do type hints work and what are their benefits?Python#languageSenior
What is the difference between an iterable and an iterator?Python#languageMiddle
What is Go and what is it designed for?Golang#languageJunior
How do you declare variables and what are Go's basic types?Golang#languageJunior
How do functions and multiple return values work in Go?Golang#languageJunior
What are structs in Go?Golang#languageJunior
How do pointers work in Go?Golang#languageJunior
What control-flow constructs does Go have?Golang#languageJunior
How do interfaces work in Go?Golang#languageMiddle
What is the difference between value and pointer receivers?Golang#languageMiddle
How does struct embedding (composition) work?Golang#languageMiddle
How do generics work in Go?Golang#languageMiddle
What are type assertions and type switches?Golang#languageMiddle
How do closures work in Go?Golang#languageMiddle
How do you encode/decode JSON in Go?Golang#languageMiddle
What is Java and what is "write once, run anywhere"?Java#languageJunior
What are primitive types vs reference types in Java?Java#languageJunior
What are Java's access modifiers?Java#languageJunior
Why are Java Strings immutable, and what is StringBuilder for?Java#languageJunior
What control-flow constructs does Java provide?Java#languageJunior
What do the static and final keywords mean?Java#languageJunior
What are generics and why use them?Java#languageMiddle
What is Optional and how does it help with null?Java#languageMiddle
What are records and sealed classes?Java#languageSenior
What are reflection and annotations used for?Java#languageSenior
How do enums work in Java?Java#languageMiddle
What is autoboxing and what are its pitfalls?Java#languageMiddle
What is PHP and where is it used?PHP#languageJunior
What are PHP's variable types?PHP#languageJunior
How do you work with strings in PHP?PHP#languageJunior
What are PHP superglobals?PHP#languageJunior
What control-flow constructs does PHP have?PHP#languageJunior
What is the difference between include and require?PHP#languageJunior
How do namespaces work in PHP?PHP#languageMiddle
How do type declarations and strict types work?PHP#languageMiddle
What major features did PHP 8.x add?PHP#languageSenior
What is C# and the .NET platform?C##languageJunior
What is the difference between value and reference types?C##languageJunior
How do you declare variables and use var?C##languageJunior
How do strings work in C#?C##languageJunior
What control-flow constructs does C# offer?C##languageJunior
How do methods, parameters and overloading work?C##languageJunior
How do namespaces and using directives work?C##languageJunior
What are nullable types and null-handling operators?C##languageJunior
What are generics and constraints?C##languageMiddle
What are delegates and events?C##languageMiddle
What are records in C#?C##languageMiddle
What are extension methods?C##languageMiddle
What is the difference between an enum, a struct and a class?C##languageMiddle
What pattern matching does modern C# support?C##languageSenior
How do iterators and the yield keyword work?C##languageMiddle
What are reflection and attributes used for?C##languageSenior
What is Ruby and its philosophy?Ruby#languageJunior
How do variables and basic types work in Ruby?Ruby#languageJunior
What is the difference between strings and symbols?Ruby#languageJunior
How do you define methods with arguments?Ruby#languageJunior
What control-flow does Ruby offer?Ruby#languageJunior
Why are symbols preferred as hash keys?Ruby#languageMiddle
What is metaprogramming in Ruby?Ruby#languageSenior
What are useful String methods and bang (!) variants?Ruby#languageMiddle
How does Ruby enable internal DSLs?Ruby#languageSenior