github.com/mymmsc/gox@v1.3.33/util/enumerable.go (about) 1 // Copyright (c) 2015, Emir Pasic. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package util 6 7 // EnumerableWithIndex provides functions for ordered containers whose values can be fetched by an index. 8 type EnumerableWithIndex interface { 9 // Each calls the given function once for each element, passing that element's index and value. 10 Each(func(index int, value interface{})) 11 12 // Map invokes the given function once for each element and returns a 13 // container containing the values returned by the given function. 14 // TODO would appreciate help on how to enforce this in containers (don't want to type assert when chaining) 15 // Map(func(index int, value interface{}) interface{}) Container 16 17 // Select returns a new container containing all elements for which the given function returns a true value. 18 // TODO need help on how to enforce this in containers (don't want to type assert when chaining) 19 // Select(func(index int, value interface{}) bool) Container 20 21 // Any passes each element of the container to the given function and 22 // returns true if the function ever returns true for any element. 23 Any(func(index int, value interface{}) bool) bool 24 25 // All passes each element of the container to the given function and 26 // returns true if the function returns true for all elements. 27 All(func(index int, value interface{}) bool) bool 28 29 // Find passes each element of the container to the given function and returns 30 // the first (index,value) for which the function is true or -1,nil otherwise 31 // if no element matches the criteria. 32 Find(func(index int, value interface{}) bool) (int, interface{}) 33 } 34 35 // EnumerableWithKey provides functions for ordered containers whose values whose elements are key/value pairs. 36 type EnumerableWithKey interface { 37 // Each calls the given function once for each element, passing that element's key and value. 38 Each(func(key interface{}, value interface{})) 39 40 // Map invokes the given function once for each element and returns a container 41 // containing the values returned by the given function as key/value pairs. 42 // TODO need help on how to enforce this in containers (don't want to type assert when chaining) 43 // Map(func(key interface{}, value interface{}) (interface{}, interface{})) Container 44 45 // Select returns a new container containing all elements for which the given function returns a true value. 46 // TODO need help on how to enforce this in containers (don't want to type assert when chaining) 47 // Select(func(key interface{}, value interface{}) bool) Container 48 49 // Any passes each element of the container to the given function and 50 // returns true if the function ever returns true for any element. 51 Any(func(key interface{}, value interface{}) bool) bool 52 53 // All passes each element of the container to the given function and 54 // returns true if the function returns true for all elements. 55 All(func(key interface{}, value interface{}) bool) bool 56 57 // Find passes each element of the container to the given function and returns 58 // the first (key,value) for which the function is true or nil,nil otherwise if no element 59 // matches the criteria. 60 Find(func(key interface{}, value interface{}) bool) (interface{}, interface{}) 61 }