Traversy 0.3.0 API documentation

Combine lenses to form a new lens.

Combine lenses in parallel to form a new lens.

A lens from map -> each entry.

A lens from map -> each key.

A lens from map -> each value.

Combine two lenses in parallel to form a new lens.

Combine two lenses to form a new lens.

A lens to a conditional value, based on a predicate.

This lens is unstable if the predicate interacts with an update.

A lens from collection -> item.

A lens from map -> value at path.

A lens from sequence -> index/item pair.

The identity lens (under 'combine').

Construct a lens from a focus function and an fmap function:
(focus x) => a sequence of foci
(fmap f x) => an updated x

A lens to an optional value.

This lens is unstable if an update converts nil to another value. 

The null lens. The identity under 'both'.

A lens from collection -> applicable items, based on a predicate.

This lens is unstable if the predicate interacts with an update.

When supplied as the f to update, sets all the foci to x.

A lens from map -> the entries corresponding to ks.

Apply f to the foci of x, as specified by lens.

Return a seq of the lens' foci.

Return the sole focus, throwing an error if there are other or no foci.

A lens from collection -> nth item.