whirl

Curried, object-accepting, data-last versions of map, each, filter and reduce. Just pieces of fast.js with curry.

Methods

map(Function callback, Object | Array data) => Array | Object

map() invokes an operation once on each itm in a collection, and collects the return values in a collection of the same type (i.e. mapping an array produces an array, likewise for objects).

Array callback(Any value, Number index)

Object callback(Any value, String key)

each(Function callback, Object | Array data) => Array | Object

each() invokes an operation once on each item in a collection and returns undefined.

Array callback(Any value, Number index)

Object callback(Any value, String key)

filter(Function callback, Object | Array data) => Array | Object

filter() invokes an operation on each item in a collection, collecting the items (not return values) for which the operation returns a truthy value. Results are of same type as input.

Array callback(Any value, Number index)

Object callback(Any value, String key)

reduce(Function callback, Any initial, Object | Array data) => Any

reduce() invokes an operation on each item in a collection, with the first argument being the accumulator, which is set to the result of the operation, and passed to the next invocation. Results are of a type determined by the operation.

Array callback(Any current, Any value, Number index)

Object callback(Any current, Any value, String key)