How deeply does Learn Haskell by Example cover zip?

Explains the polymorphic type, element-wise behavior, shortest-list rule, unzip limitation, and zipWith relationship.

Zip

As explained in Learn Haskell by Example

zip is a standard Haskell function that combines two lists element-wise into a list of pairs, stopping when the shorter list ends.

zip combines two lists element by element, producing pairs with type [a] -> [b] -> [(a, b)]. It stops when the shorter list ends. section 4.3.3

This makes zip useful for pairing line numbers with lines and for constructing associative lists without writing specialized recursive code. unzip separates pairs again, but it cannot restore elements discarded from a longer input list. section 4.3.3

Pairing positions with values

zip [1,2,3] ["Hello", "World", "!"] produces [(1,"Hello"),(2,"World"),(3,"!")]. With zip [1..10] [], the result is [], because the empty list determines the stopping point.

When each pair should be transformed immediately, use zipWith, whose type is (a -> b -> c) -> [a] -> [b] -> [c].

How Learn Haskell by Example covers it

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Also explained in

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The Quick Python Book, Fourth Editionzip is a Python built-in function that aggregates corresponding elements from two or more iterables into tuples, stopping when the shortest iterable is exhausted.

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Related concepts

tupleproduces · A tuple is a finite, ordered collection of elements treated as a single composite value or record.
iterableuses · An iterable is an object or value that provides or supports a protocol for producing its elements sequentially.
generatorimplemented by · A generator is a language construct or computation that produces values incrementally on demand, typically suspending and resuming while preserving its state.
iteratorproduces · An iterator is an object or abstraction that provides successive values from a sequence or data source through a traversal protocol.

This explainer was generated by Manning's knowledge graph from the text of Learn Haskell by Example. The section links point to the parts of the book it draws on.