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List and Array

List​

List comprehension​

see haskell doc math, set comprehension

Array​

Aspect Prim.Array Data.Array Mutability Mutable (JS arrays) Immutable Import Automatic Explicit import needed API Very limited Rich functional API Safety Unsafe operations Type-safe with Maybe Performance Faster (mutable) Slower (immutable copies) Usage FFI, performance-critical General PureScript code

Array comprehension​

tip

A pattern like x:xs will bind the head of the list to x and the rest of it to xs, even if there's only one element so xs ends up being an empty list. Note: The x:xs pattern is used a lot, especially with recursive functions.