Arafatk/DataViz

package containers

// EnumerableWithIndex provides functions for ordered containers whose values can be fetched by an index.
type EnumerableWithIndex interface {
    // Each calls the given function once for each element, passing that element's index and value.
    Each(func(index int, value interface{}))

    // Map invokes the given function once for each element and returns a
    // container containing the values returned by the given function.
    // TODO would appreciate help on how to enforce this in containers (don't want to type assert when chaining)
    // Map(func(index int, value interface{}) interface{}) Container

    // Select returns a new container containing all elements for which the given function returns a true value.
    // TODO need help on how to enforce this in containers (don't want to type assert when chaining)
    // Select(func(index int, value interface{}) bool) Container

    // Any passes each element of the container to the given function and
    // returns true if the function ever returns true for any element.
    Any(func(index int, value interface{}) bool) bool

    // All passes each element of the container to the given function and
    // returns true if the function returns true for all elements.
    All(func(index int, value interface{}) bool) bool

    // Find passes each element of the container to the given function and returns
    // the first (index,value) for which the function is true or -1,nil otherwise
    // if no element matches the criteria.
    Find(func(index int, value interface{}) bool) (int, interface{})
}

// EnumerableWithKey provides functions for ordered containers whose values whose elements are key/value pairs.
type EnumerableWithKey interface {
    // Each calls the given function once for each element, passing that element's key and value.
    Each(func(key interface{}, value interface{}))

    // Map invokes the given function once for each element and returns a container
    // containing the values returned by the given function as key/value pairs.
    // TODO need help on how to enforce this in containers (don't want to type assert when chaining)
    // Map(func(key interface{}, value interface{}) (interface{}, interface{})) Container

    // Select returns a new container containing all elements for which the given function returns a true value.
    // TODO need help on how to enforce this in containers (don't want to type assert when chaining)
    // Select(func(key interface{}, value interface{}) bool) Container

    // Any passes each element of the container to the given function and
    // returns true if the function ever returns true for any element.
    Any(func(key interface{}, value interface{}) bool) bool

    // All passes each element of the container to the given function and
    // returns true if the function returns true for all elements.
    All(func(key interface{}, value interface{}) bool) bool

    // Find passes each element of the container to the given function and returns
    // the first (key,value) for which the function is true or nil,nil otherwise if no element
    // matches the criteria.
    Find(func(key interface{}, value interface{}) bool) (interface{}, interface{})
}