module Indexable::Mutable(T)

Overview

An Indexable container that is additionally mutable.

Including types may write values to numeric indices, apart from reading them. This module does not cover cases where the container is resized.

Included Modules

Direct including types

Defined in:

indexable/mutable.cr

Instance Method Summary

Instance methods inherited from module Indexable(T)

[](index : Int) [], []?(index : Int) []?, bsearch(& : T -> _) bsearch, bsearch_index(& : T, Int32 -> _) bsearch_index, cartesian_product(*others : Indexable) cartesian_product, combinations(size : Int = self.size) combinations, dig(index : Int, *subindexes) dig, dig?(index : Int, *subindexes) dig?, each(& : T -> )
each
each(*, start : Int, count : Int, & : T -> )
each(*, within range : Range, & : T -> )
each
, each_cartesian(*others : Indexable, &)
each_cartesian(*others : Indexable)
each_cartesian
, each_combination(size : Int = self.size, reuse = false, &) : Nil
each_combination(size : Int = self.size, reuse = false)
each_combination
, each_index(& : Int32 -> ) : Nil
each_index
each_index(*, start : Int, count : Int, &)
each_index
, each_permutation(size : Int = self.size, reuse = false, &) : Nil
each_permutation(size : Int = self.size, reuse = false)
each_permutation
, each_repeated_combination(size : Int = self.size, reuse = false, &) : Nil
each_repeated_combination(size : Int = self.size, reuse = false)
each_repeated_combination
, empty? : Bool empty?, equals?(other : Indexable, &) : Bool
equals?(other, &)
equals?
, fetch(index : Int, &)
fetch(index, default)
fetch
, first(&) first, hash(hasher) hash, index(object, offset : Int = 0)
index(offset : Int = 0, & : T -> )
index
, index!(obj, offset : Int = 0)
index!(offset : Int = 0, & : T -> )
index!
, join(separator : String | Char | Number = "") : String join, last : T
last(&)
last
, last? : T | Nil last?, permutations(size : Int = self.size) : Array(Array(T)) permutations, repeated_combinations(size : Int = self.size) : Array(Array(T)) repeated_combinations, reverse_each(& : T -> ) : Nil
reverse_each
reverse_each
, rindex(value, offset = size - 1)
rindex(offset = size - 1, & : T -> )
rindex
, sample(n : Int, random = Random::DEFAULT) : Array(T)
sample(random = Random::DEFAULT)
sample
, size size, to_a : Array(T) to_a, unsafe_fetch(index : Int) unsafe_fetch, values_at(*indexes : Int) values_at

Class methods inherited from module Indexable(T)

cartesian_product(indexables : Indexable(Indexable)) cartesian_product, each_cartesian(indexables : Indexable(Indexable), reuse = false, &)
each_cartesian(indexables : Indexable(Indexable), reuse = false)
each_cartesian

Instance methods inherited from module Enumerable(T)

accumulate(initial : U) : Array(U) forall U
accumulate : Array(T)
accumulate(initial : U, &block : U, T -> U) : Array(U) forall U
accumulate(&block : T, T -> T) : Array(T)
accumulate
, all?(& : T -> ) : Bool
all?(pattern) : Bool
all? : Bool
all?
, any?(& : T -> ) : Bool
any?(pattern) : Bool
any? : Bool
any?
, chunks(&block : T -> U) forall U chunks, compact_map(& : T -> _) compact_map, count(& : T -> ) : Int32
count(item) : Int32
count
, cycle(n, & : T -> ) : Nil
cycle(& : T -> ) : Nil
cycle
, each(& : T -> ) each, each_cons(count : Int, reuse = false, &) each_cons, each_cons_pair(& : T, T -> ) : Nil each_cons_pair, each_slice(count : Int, reuse = false, &) each_slice, each_with_index(offset = 0, &) each_with_index, each_with_object(obj : U, & : T, U -> ) : U forall U each_with_object, empty? : Bool empty?, find(if_none = nil, & : T -> ) find, find!(& : T -> ) : T find!, first(&)
first(count : Int) : Array(T)
first : T
first
, first? : T | Nil first?, flat_map(& : T -> _) flat_map, group_by(& : T -> U) forall U group_by, in_groups_of(size : Int, filled_up_with : U = nil) forall U
in_groups_of(size : Int, filled_up_with : U = nil, reuse = false, &) forall U
in_groups_of
, includes?(obj) : Bool includes?, index(& : T -> ) : Int32 | Nil
index(obj) : Int32 | Nil
index
, index!(& : T -> ) : Int32
index!(obj) : Int32
index!
, index_by(& : T -> U) : Hash(U, T) forall U index_by, join(io : IO, separator = "") : Nil
join(separator, io : IO) : Nil
join(separator = "") : String
join(io : IO, separator = "", & : T, IO -> )
join(separator, io : IO, &)
join(separator = "", & : T -> )
join
, map(& : T -> U) : Array(U) forall U map, map_with_index(offset = 0, & : T, Int32 -> U) : Array(U) forall U map_with_index, max : T max, max? : T | Nil max?, max_by(& : T -> U) : T forall U max_by, max_by?(& : T -> U) : T | Nil forall U max_by?, max_of(& : T -> U) : U forall U max_of, max_of?(& : T -> U) : U | Nil forall U max_of?, min : T min, min? : T | Nil min?, min_by(& : T -> U) : T forall U min_by, min_by?(& : T -> U) : T | Nil forall U min_by?, min_of(& : T -> U) : U forall U min_of, min_of?(& : T -> U) : U | Nil forall U min_of?, minmax : Tuple(T, T) minmax, minmax? : Tuple(T | Nil, T | Nil) minmax?, minmax_by(& : T -> U) : Tuple(T, T) forall U minmax_by, minmax_by?(& : T -> U) : Tuple(T, T) | Tuple(Nil, Nil) forall U minmax_by?, minmax_of(& : T -> U) : Tuple(U, U) forall U minmax_of, minmax_of?(& : T -> U) : Tuple(U, U) | Tuple(Nil, Nil) forall U minmax_of?, none?(& : T -> ) : Bool
none?(pattern) : Bool
none? : Bool
none?
, one?(& : T -> ) : Bool
one?(pattern) : Bool
one? : Bool
one?
, partition(& : T -> ) : Tuple(Array(T), Array(T)) partition, product(initial : Number)
product
product(initial : Number, & : T -> )
product(& : T -> _)
product
, reduce(memo, &)
reduce(&)
reduce
, reduce?(&) reduce?, reject(& : T -> )
reject(type : U.class) forall U
reject(pattern) : Array(T)
reject
, sample(n : Int, random = Random::DEFAULT) : Array(T)
sample(random = Random::DEFAULT) : T
sample
, select(& : T -> )
select(type : U.class) : Array(U) forall U
select(pattern) : Array(T)
select
, size : Int32 size, skip(count : Int) skip, skip_while(& : T -> ) : Array(T) skip_while, sum(initial)
sum
sum(initial, & : T -> )
sum(& : T -> )
sum
, take_while(& : T -> ) : Array(T) take_while, tally(hash)
tally : Hash(T, Int32)
tally
, tally_by(hash, &)
tally_by(&block : T -> U) : Hash(U, Int32) forall U
tally_by
, to_a to_a, to_h
to_h(& : T -> Tuple(K, V)) forall K, V
to_h
, to_set : Set(T) to_set, zip(*others : Indexable | Iterable | Iterator, &)
zip(*others : Indexable | Iterable | Iterator)
zip
, zip?(*others : Indexable | Iterable | Iterator, &)
zip?(*others : Indexable | Iterable | Iterator)
zip?

Class methods inherited from module Enumerable(T)

element_type(x) element_type

Instance methods inherited from module Iterable(T)

chunk(reuse = false, &block : T -> U) forall U chunk, chunk_while(reuse : Bool | Array(T) = false, &block : T, T -> B) forall B chunk_while, cycle(n)
cycle
cycle
, each each, each_cons(count : Int, reuse = false) each_cons, each_cons_pair each_cons_pair, each_slice(count : Int, reuse = false) each_slice, each_with_index(offset = 0) each_with_index, each_with_object(obj) each_with_object, slice_after(reuse : Bool | Array(T) = false, &block : T -> B) forall B
slice_after(pattern, reuse : Bool | Array(T) = false)
slice_after
, slice_before(reuse : Bool | Array(T) = false, &block : T -> B) forall B
slice_before(pattern, reuse : Bool | Array(T) = false)
slice_before
, slice_when(reuse : Bool | Array(T) = false, &block : T, T -> B) forall B slice_when

Instance Method Detail

def []=(index : Int, value : T) : T #

Sets the given value at the given index. Returns value.

Negative indices can be used to start counting from the end of the container. Raises IndexError if trying to set an element outside the container's range.

ary = [1, 2, 3]
ary[0] = 5
ary # => [5, 2, 3]

ary[3] = 5 # raises IndexError

[View source]
def fill(value : T, start : Int, count : Int) : self #

Replaces count or less (if there aren't enough) elements starting at the given start index with value. Returns self.

Negative values of start count from the end of the container.

Raises IndexError if the start index is out of range.

Raises ArgumentError if count is negative.

array = [1, 2, 3, 4, 5]
array.fill(9, 2, 2) # => [1, 2, 9, 9, 5]
array               # => [1, 2, 9, 9, 5]

[View source]
def fill(value : T, range : Range) : self #

Replaces the elements within the given range with value. Returns self.

Negative indices count backward from the end of the container.

Raises IndexError if the starting index is out of range.

array = [1, 2, 3, 4, 5]
array.fill(9, 2..3) # => [1, 2, 9, 9, 5]
array               # => [1, 2, 9, 9, 5]

[View source]
def fill(value : T) : self #

Replaces every element in self with the given value. Returns self.

array = [1, 2, 3, 4]
array.fill(2) # => [2, 2, 2, 2]
array         # => [2, 2, 2, 2]

[View source]
def fill(start : Int, count : Int, & : Int32 -> T) : self #

Yields each index of self, starting at start and for count times (or less if there aren't enough elements), to the given block and then assigns the block's value in that position. Returns self.

Negative values of start count from the end of the container.

Has no effect if count is zero or negative.

Raises IndexError if start is outside the array range.

a = [1, 2, 3, 4, 5, 6]
a.fill(2, 3) { |i| i * i * i } # => [1, 2, 8, 27, 64, 6]

[View source]
def fill(range : Range, & : Int32 -> T) : self #

Yields each index of self, in the given range, to the given block and then assigns the block's value in that position. Returns self.

Negative indices count backward from the end of the container.

Raises IndexError if the starting index is out of range.

a = [1, 2, 3, 4, 5, 6]
a.fill(2..4) { |i| i * i * i } # => [1, 2, 8, 27, 64, 6]

[View source]
def fill(*, offset : Int = 0, & : Int32 -> T) : self #

Yields each index of self to the given block and then assigns the block's value in that position. Returns self.

Accepts an optional offset parameter, which tells the block to start counting from there.

array = [2, 1, 1, 1]
array.fill { |i| i * i }            # => [0, 1, 4, 9]
array                               # => [0, 1, 4, 9]
array.fill(offset: 3) { |i| i * i } # => [9, 16, 25, 36]
array                               # => [9, 16, 25, 36]

[View source]
def map!(& : T -> _) : self #

Invokes the given block for each element of self, replacing the element with the value returned by the block. Returns self.

a = [1, 2, 3]
a.map! { |x| x * x }
a # => [1, 4, 9]

[View source]
def map_with_index!(offset = 0, & : T, Int32 -> _) : self #

Like #map!, but the block gets passed both the element and its index.

Accepts an optional offset parameter, which tells it to start counting from there.

gems = ["crystal", "pearl", "diamond"]
gems.map_with_index! { |gem, i| "#{i}: #{gem}" }
gems # => ["0: crystal", "1: pearl", "2: diamond"]

[View source]
def reverse! : self #

Reverses in-place all the elements of self. Returns self.


[View source]
def rotate!(n : Int = 1) : self #

Shifts all elements of self to the left n times. Returns self.

a1 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
a2 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
a3 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

a1.rotate!
a2.rotate!(1)
a3.rotate!(3)

a1 # => [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
a2 # => [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
a3 # => [3, 4, 5, 6, 7, 8, 9, 0, 1, 2]

[View source]
def shuffle!(random = Random::DEFAULT) : self #

Modifies self by randomizing the order of elements in the collection using the given random number generator. Returns self.

a = [1, 2, 3, 4, 5]
a.shuffle!(Random.new(42)) # => [3, 2, 4, 5, 1]
a                          # => [3, 2, 4, 5, 1]

[View source]
def sort! : self #

Sorts all elements in self based on the return value of the comparison method T#<=> (see Comparable#<=>), using a stable sort algorithm.

a = [3, 1, 2]
a.sort!
a # => [1, 2, 3]

This sort operation modifies self. See #sort for a non-modifying option that allocates a new instance.

See Slice#sort! for details on the implementation.

Raises ArgumentError if the comparison between any two elements returns nil.


[View source]
def sort!(&block : T, T -> U) : self forall U #

Sorts all elements in self based on the comparator in the given block, using a stable sort algorithm.

The block must implement a comparison between two elements a and b, where a < b returns -1, a == b returns 0, and a > b returns 1. The comparison operator <=> can be used for this.

a = [3, 1, 2]
# This is a reverse sort (forward sort would be `a <=> b`)
a.sort! { |a, b| b <=> a }
a # => [3, 2, 1]

This sort operation modifies self. See #sort(&block : T, T -> U) for a non-modifying option that allocates a new instance.

See Slice#sort!(&block : T, T -> U) for details on the implementation.

Raises ArgumentError if for any two elements the block returns nil.


[View source]
def sort_by!(&block : T -> _) : self #

Sorts all elements in self by the output value of the block. The output values are compared via the comparison method #<=> (see Comparable#<=>), using a stable sort algorithm.

a = %w(apple pear fig)
a.sort_by! { |word| word.size }
a # => ["fig", "pear", "apple"]

This sort operation modifies self. See #sort_by(&block : T -> _) for a non-modifying option that allocates a new instance.

If stability is expendable, #unstable_sort_by!(&block : T -> _) provides a performance advantage over stable sort.

See #sort!(&block : T -> _) for details on the sorting mechanism.

Raises ArgumentError if the comparison between any two comparison values returns nil.


[View source]
def swap(index0 : Int, index1 : Int) : self #

Swaps the elements at index0 and index1. Returns self.

Negative indices can be used to start counting from the end of the container. Raises IndexError if either index is out of bounds.

a = ["first", "second", "third"]
a.swap(1, 2)  # => ["first", "third", "second"]
a             # => ["first", "third", "second"]
a.swap(0, -1) # => ["second", "third", "first"]
a             # => ["second", "third", "first"]
a.swap(2, 3)  # raises IndexError

[View source]
abstract def unsafe_put(index : Int, value : T) #

Sets the element at the given index to value, without doing any bounds check.

Indexable::Mutable makes sure to invoke this method with index in 0...size, so converting negative indices to positive ones is not needed here.

Clients never invoke this method directly. Instead, they modify elements with #[]=(index, value).

This method should only be directly invoked if you are absolutely sure the index is in bounds, to avoid a bounds check for a small boost of performance.


[View source]
def unstable_sort! : self #

Sorts all elements in self based on the return value of the comparison method T#<=> (see Comparable#<=>), using an unstable sort algorithm.

a = [3, 1, 2]
a.unstable_sort!
a # => [1, 2, 3]

This sort operation modifies self. See #unstable_sort for a non-modifying option that allocates a new instance.

See Slice#unstable_sort! for details on the implementation.

Raises ArgumentError if the comparison between any two elements returns nil.


[View source]
def unstable_sort!(&block : T, T -> U) : self forall U #

Sorts all elements in self based on the comparator in the given block, using an unstable sort algorithm.

The block must implement a comparison between two elements a and b, where a < b returns -1, a == b returns 0, and a > b returns 1. The comparison operator <=> can be used for this.

a = [3, 1, 2]
# This is a reverse sort (forward sort would be `a <=> b`)
a.unstable_sort! { |a, b| b <=> a }
a # => [3, 2, 1]

This sort operation modifies self. See #unstable_sort(&block : T, T -> U) for a non-modifying option that allocates a new instance.

See Slice#unstable_sort!(&block : T, T -> U) for details on the implementation.

Raises ArgumentError if for any two elements the block returns nil.


[View source]
def unstable_sort_by!(&block : T -> _) : self #

Sorts all elements in self by the output value of the block. The output values are compared via the comparison method #<=> (see Comparable#<=>), using an unstable sort algorithm.

a = %w(apple pear fig)
a.unstable_sort_by! { |word| word.size }
a # => ["fig", "pear", "apple"]

This sort operation modifies self. See #unstable_sort_by(&block : T -> _) for a non-modifying option that allocates a new instance.

If stability is necessary, use #sort_by!(&block : T -> _) instead.

See #unstable_sort!(&block : T -> _) for details on the sorting mechanism.

Raises ArgumentError if the comparison between any two comparison values returns nil.


[View source]
def update(index : Int, & : T -> _) : T #

Yields the current element at the given index and updates the value at that index with the block's value. Returns the new value.

Raises IndexError if trying to set an element outside the container's range.

array = [1, 2, 3]
array.update(1) { |x| x * 2 } # => 4
array                         # => [1, 4, 3]
array.update(5) { |x| x * 2 } # raises IndexError

[View source]