The "Unknown:"s below indicate that an entry is incomplete.

• either the entry exist in the language, and please tell.
• either the entry doesn't exist in the language, and please tell so. The entry will be marked as such and won't appear as missing anymore.

See the various entries for C#

• Category: Object Oriented, Has anonymous functions, Statically typed

• Functions

  delegate(ta a, tb b) { ... }

  anonymous function

• Strings

  Unknown:

  serialize (marshalling)
  unserialize (un-marshalling)

• Bags and Lists

  Unknown:

  list concatenation
  list flattening
  adding an element at the beginning (list cons)
  adding an element at index
  adding an element at the end
  first element
  all but the first element
  last element
  get the first element and remove it
  get the last element and remove it
  transform a list (or bag) in another one
  transform two lists in parallel
  find an element
  keep elements
  is an element in the list
  is the predicate true for an element
  is the predicate true for every element
  smallest / biggest element
  iterate with index
  remove duplicates
  f(... f(f(init, e1), e2) ..., en)

• Various Data Types

  Unknown:

  record (type declaration)
  union type declaration
  dictionary (type name)
  dictionary (merge)
  range

• Mathematics

  Unknown:

  random (seed the pseudo random generator)