Coalescing

Optional Chaining and Nullish Coalescing

The ES2020 ?. and ?? operators for safely accessing nested properties and providing defaults only for null/undefined.

Nil Coalescing Operator in Swift

The `??` operator supplies a default value when an optional is nil, in a single concise expression.

Conditionals in PHP

Covers if/elseif/else, the ternary and null-coalescing shortcuts, switch statements, and alternative control-structure syntax used in templates.

Modern JavaScript (ES2020+) Cheat Sheet

Summarizes optional chaining, nullish coalescing, BigInt, new Promise combinators, private class fields, and other ES2020-ES2023 additions.

What is the Buddy System for Memory Allocation?

The buddy system is a kernel memory allocator that manages physical memory in power-of-two-sized blocks, splitting a large free block into two equal buddies to…