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Revision as of 23:06, 1 November 2011

There was a thread on Haskell-Cafe about how to pronounce Haskell.

Below are some notes for beginners on how to pronounce those strange Haskell operators and 'read' Haskell programs.

This is meant to be a table with formal and informal ways of saying various operators and code snippets.

Symbol Pronunciation References
has type (in definitions); at type (in expressions or patterns)
maps to, to
equals Prelude
not equals Prelude
is a witness for, implies Type Classes and Overloading
dot (could be used anywhere, but especially in, for example, Data.Char.ord), ring, compose (for example, negate . (+1)), (silent) (for example, forall a. (Num a) => a)
drawn from, from
arrow application Arrows syntax
both, fanout Control.Arrow
either, fanin Control.Arrow
append Prelude
bind About monads
Monads as containers
then, sequence Prelude
applied over Applicative Functors
lambda Lambda abstraction
Haskell 98 Report
bang; strict (in patterns or data definitions); index (in expressions) Bang Patterns
irrefutable, lazy (in patterns)
2-tuple, pair
[3-]tuple [of] a, b, and c
just as inconvenient to convey grouping verbally, whether it's layout or punctuation
Example Pronunciation
f :: Int -> Int
f has type Int to Int

Thoughts on improving this page:

The tables above would be best split into more columns to distinguish Informal, possibly bad suggestions like "then", "is", "gets", from Formal correct ways of saying the same thing. The Symbols could also be named in a literal way in another column, such as "arrow" or "double-colon". The Description column can be quite brief and a link provided to the relevant wiki page for the operator.

Some words, particularly the informal ones, may be good for several different symbols, but these can hopefully be arranged so that their context will make them unambiguous when reading a code snippet.