Arrays store elements in contiguous memory. Access is O(1). Search and modification require iterating. This guide covers six algorithms that appear repeatedly in array problems: binary search, two pointers, sliding window, prefix sums, divide and conquer, and the Dutch national flag.
Recursion and iteration are interchangeable. Any loop can be rewritten as recursion, and any recursion can be rewritten as a loop using an explicit stack. The difference is cost. Recursion consumes the call stack and adds per-call overhead. Iteration does neither. The right choice depends on the problem structure and the language.
A container is not a virtual machine. VMs emulate hardware and run a full OS kernel. Containers share the host kernel and isolate processes using namespaces (which partition what a process sees: filesystem, network, PIDs, users) and cgroups (which cap what it uses: CPU, memory, I/O).
Jekyll is a static site generator written in Ruby. It renders Markdown through Liquid templates into static HTML. The published site is a directory of files with no database and no server-side runtime at request time.
On Apple Silicon, the Ruby toolchain needs a little setup first: Homebrew, a Ruby version manager, and the gem path.
业精于勤荒于嬉，行成于思毁于随。
Achievements are reached by hard work rather than recreation. Actions are done after thorough consideration rather than casual decisions.