What I can remember learning from various languages and technologies

An incomplete list and not in any particular order.

Visual Basic

  • Types
  • Values
  • Conditions
  • Loops
  • Procedures (subroutines)
  • Event driven style
  • Assignment

JavaScript

  • Procedure expressions
    • E.g. A callback system
  • Closures
  • Function scope
  • Observer pattern
  • Type coersion
  • Module pattern
    • Revealing module style
    • CommonJS style
  • Hash map data structure
  • JSON

jQuery

  • Call chaining

C

  • Memory allocation
  • Pointers
  • References
  • Preprocessor Macros
  • Block scope

C#

  • Classes and Objects
  • Inheritance
  • Polymorphism
  • Linked Lists
  • Array Lists

Objective-C

  • Messaging
  • Interfaces (Protocols)

Java

  • Decorator pattern
  • String Buffers
  • String Builders
  • Iterators
  • Threads

Clojure

  • Lambda expressions
  • Code as Data
  • Macros and Quoting
  • Keywords
  • Destructuring (Pattern matching)
  • Futures
  • Functional Programming
    • Map
    • Folding
    • Laziness
    • Tail-recursion
    • Recursive Accumulators
    • Immutability

Haskell

  • Function composition
  • Point-free programming
  • Monads (NOTE:Still learning)

PHP

  • Output buffers

Qt

  • Signals and Slots

CSS

  • Prescedence Value

Ruby

  • Generators

Structural Operational Semantics

  • Relations
  • Pattern Matching by construction
  • Preconditions and Postconditions
  • Invariants

Lambda Calculus (and related concepts)

  • SKI Combinators