Ruby/Справочник/Set

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Класс Set[править]

Set implements a collection of unordered values with no duplicates. This is a hybrid of Array's intuitive inter-operation facilities and Hash's fast lookup. Several methods accept any Enumerable object (implementing each) for greater flexibility: new, replace, merge, subtract, |, &, -, ^. The equality of each couple of elements is determined according to Object#eql? and Object#hash, since Set uses Hash as storage. Finally, if you are using class Set, you can also use Enumerable#to_set for convenience.

Example

 require 'set'
 s1 = Set.new [1, 2]                   # -> #<Set: {1, 2}>
 s2 = [1, 2].to_set                    # -> #<Set: {1, 2}>
 s1 == s2                              # -> true
 s1.add("foo")                         # -> #<Set: {1, 2, "foo"}>
 s1.merge([2, 6])                      # -> #<Set: {6, 1, 2, "foo"}>
 s1.subset? s2                         # -> false
 s2.subset? s1                         # -> true

Примеси

Enumerable (all?, any?, collect, detect, each_cons, each_slice, each_with_index, entries, enum_cons, enum_slice, enum_with_index, find, find_all, grep, group_by, include?, index_by, inject, map, max, member?, min, partition, reject, select, sort, sort_by, sum, to_a, to_set, zip)

Методы класса

[], new

Методы объекта

&, +, -, <<, ==, ^, add?, add, classify, clear, collect!, delete?, delete_if, delete, difference, divide, each, empty?, flatten!, flatten_merge, flatten, include?, initialize_copy, inspect, intersection, length, map!, member?, merge, proper_subset?, proper_superset?, reject!, replace, size, subset?, subtract, superset?, to_a, union, ||

Set::[][править]


 Set::[](*ary)

Creates a new set containing the given objects.

Set::new[править]


 Set::new(enum = nil) {|o| ...}

Creates a new set containing the elements of the given enumerable object. If a block is given, the elements of enum are preprocessed by the given block.

Set#&[править]


 &(enum)

Returns a new array containing elements common to the set and the given enumerable object.

(еще известен как intersection)

Set#+[править]


 +(enum)

Alias for #|

Set#-[править]


 -(enum)

Returns a new set built by duplicating the set, removing every element that appears in the given enumerable object.

(еще известен как difference)

Set#<<[править]


 <<(o)

Alias for #add

Set#==[править]


 ==(set)

Returns true if two sets are equal. The equality of each couple of elements is defined according to Object#eql?.

Set#^[править]


 ^(enum)

Returns a new array containing elements exclusive between the set and the given enumerable object. (set ^ enum) is equivalent to ((set | enum) - (set & enum)).

Set#add[править]


 add(o)

Adds the given object to the set and returns self. Use merge to add several elements at once.

(еще известен как <<)

Set#add?[править]


 add?(o)

Метод добавляет полученный объект в коллекцию и возвращает саму коллекцию с уже добавленным объектом. Если объект уже существует в коллекции, то метод вернёт nil.

Set#classify[править]


 classify( {|o| ...}

Classifies the set by the return value of the given block and returns a hash of {value => set of elements} pairs. The block is called once for each element of the set, passing the element as parameter. e.g.:

 require 'set'
 files = Set.new(Dir.glob("*.rb"))
 hash = files.classify { |f| File.mtime(f).year }
 p hash    # => {2000=>#<Set: {"a.rb", "b.rb"}>,
           #     2001=>#<Set: {"c.rb", "d.rb", "e.rb"}>,
           #     2002=>#<Set: {"f.rb"}>}

Set#clear[править]


 clear()

Removes all elements and returns self.

Set#collect![править]


 collect!() {|o| ...}

Do collect() destructively.

(еще известен как map!)

Set#delete[править]


 delete(o)

Deletes the given object from the set and returns self. Use subtract to delete several items at once.

Set#delete?[править]


 delete?(o)

Deletes the given object from the set and returns self. If the object is not in the set, returns nil.

Set#delete_if[править]


 delete_if() {|o| ...}

Deletes every element of the set for which block evaluates to true, and returns self.

Set#difference[править]


 difference(enum)

Alias for #-

Set#divide[править]


 divide(&func)

Divides the set into a set of subsets according to the commonality defined by the given block. If the arity of the block is 2, elements o1 and o2 are in common if block.call(o1, o2) is true. Otherwise, elements o1 and o2 are in common if block.call(o1) == block.call(o2). e.g.:

 require 'set'
 numbers = Set[1, 3, 4, 6, 9, 10, 11]
 set = numbers.divide { |i,j| (i - j).abs == 1 }
 p set     # => #<Set: {#<Set: {1}>,
           #            #<Set: {11, 9, 10}>,
           #            #<Set: {3, 4}>,
           #            #<Set: {6}>}>

Set#each[править]


 each() {|o| ...}

Calls the given block once for each element in the set, passing the element as parameter.

Set#empty?[править]


 empty?()

Returns true if the set contains no elements.

Set#flatten[править]


 flatten()

Returns a new set that is a copy of the set, flattening each containing set recursively.

Set#flatten![править]


 flatten!()

Equivalent to Set#flatten, but replaces the receiver with the result in place. Returns nil if no modifications were made.

Set#flatten_merge[править]


 flatten_merge(set, seen = Set.new)

(нет описания...)

Set#include?[править]


 include?(o)

Returns true if the set contains the given object.

(еще известен как member?)

Set#initialize_copy[править]


 initialize_copy(orig)

Copy internal hash.

Set#inspect[править]


 inspect()

Returns a string containing a human-readable representation of the set. ("#<Set: {element1, element2, ...}>")

Set#intersection[править]


 intersection(enum)

Alias for #&

Set#length[править]


 length()

Alias for #size

Set#map![править]


 map!()

Alias for #collect!

Set#member?[править]


 member?(o)

Alias for #include?

Set#merge[править]


 merge(enum)

Merges the elements of the given enumerable object to the set and returns self.

Set#proper_subset?[править]


 proper_subset?(set)

Returns true if the set is a proper subset of the given set.

Set#proper_superset?[править]


 proper_superset?(set)

Returns true if the set is a proper superset of the given set.

Set#reject![править]


 reject!() {|o| ...}

Equivalent to Set#delete_if, but returns nil if no changes were made.

Set#replace[править]


 replace(enum)

Replaces the contents of the set with the contents of the given enumerable object and returns self.

Set#size[править]


 size()

Returns the number of elements.

(еще известен как length)

Set#subset?[править]


 subset?(set)

Returns true if the set is a subset of the given set.

Set#subtract[править]


 subtract(enum)

Deletes every element that appears in the given enumerable object and returns self.

Set#superset?[править]


 superset?(set)

Returns true if the set is a superset of the given set.

Set#to_a[править]


 to_a()

Converts the set to an array. The order of elements is uncertain.

Set#union[править]


 union(enum)

Alias for #|

Set#|[править]


 |(enum)

Returns a new set built by merging the set and the elements of the given enumerable object.

(еще известен как +, union)