interface SortedMap<K,V>

A type-invariant immutable Map of key type K, and value type V. In the Map, each key has exactly one value, and the Map cannot contain duplicate keys. See the Map documentation and the SortedMap API documentation

Companion namespace: SortedMap

Type parameters

Name	Description
K	the key type
V	the value type

note

• The SortedMap keeps the inserted keys in sorted order according to the context's comp Comp instance.

example

const m1 = SortedMap.empty<number, string>()
const m2 = SortedMap.of([1, 'a'], [2, 'b'])

Methods

drop

Returns a SortedMap containing all but the first amount of elements of this SortedMap.

Definition

drop(amount: number): SortedMap<K, V>;

Parameters

Name	Type	Description
amount	number	the amount of elements to drop

note

a negative amount drops the last elements instead of the first, e.g. -2 is the last 2 elements

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.drop(2).toArray())
// => [['c', 3], ['d', 4]]
console.log(m.drop(-2).toArray())
// => [['a', 1], ['b', 2]]

findIndex

Returns the index of the given key in the SortedMap, or -1 if the key is not present.

Definition

findIndex(key: K): number;

Parameters

Name	Type	Description
key	K	the key to find the index for

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]);
console.log(m.findIndex('c'))
// => 2
console.log(m.findIndex('q'))
// => -1

getAtIndex

Returns the entry with its key at the given index of the key sort order of the SortedMap, or a fallback value (default: undefined) if the index is out of bounds.

Definitions

getAtIndex(index: number): readonly [K, V] | undefined;

getAtIndex<O>(index: number, otherwise: OptLazy<O>): readonly [K, V] | O;

Parameters

Name	Type	Description
index	number	the index in the key sort order

note

negative index values will retrieve the values from the end of the sort order, e.g. -1 is the last value

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.getAtIndex(1))
// => ['b', 2]
console.log(m.getAtIndex(-1))
// => ['d', 4]
console.log(m.getAtIndex(10))
// => undefined
console.log(m.getAtIndex(10, 'q'))
// => 'q'

getKeyAtIndex

Returns the key at the given index of the key sort order of the SortedMap, or a fallback value (default: undefined) if the index is out of bounds.

Definitions

getKeyAtIndex(index: number): K | undefined;

getKeyAtIndex<O>(index: number, otherwise: OptLazy<O>): K | O;

Parameters

Name	Type	Description
index	number	the index in the key sort order

note

negative index values will retrieve the values from the end of the sort order, e.g. -1 is the last value

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.getKeyAtIndex(1))
// => 'b'
console.log(m.getKeyAtIndex(-1))
// => 'd'
console.log(m.getKeyAtIndex(10))
// => undefined
console.log(m.getKeyAtIndex(10, 'q'))
// => 'q'

getValueAtIndex

Returns the value associated with the key at the given index of the key sort order of the SortedMap, or a fallback value (default: undefined) if the index is out of bounds.

Definitions

getValueAtIndex(index: number): V | undefined;

getValueAtIndex<O>(index: number, otherwise: OptLazy<O>): V | O;

Parameters

Name	Type	Description
index	number	the index in the key sort order

note

negative index values will retrieve the values from the end of the sort order, e.g. -1 is the last value

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.getValueAtIndex(1))
// => 2
console.log(m.getValueAtIndex(-1))
// => 4
console.log(m.getValueAtIndex(10))
// => undefined
console.log(m.getValueAtIndex(10, 'q'))
// => 'q'

max

Returns the entry with the maximum key of the SortedMap, or a fallback value (default: undefined) if the SortedMap is empty.

Definitions

max(): readonly [K, V] | undefined;

max<O>(otherwise: OptLazy<O>): readonly [K, V] | O;

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.max())
// => ['d', 4]
console.log(m.max('q'))
// => ['d', 4]
console.log(SortedMap.empty().max())
// => undefined
console.log(SortedMap.empty().max('q'))
// => 'q'

maxKey

Returns the maximum key of the SortedMap, or a fallback value (default: undefined) if the SortedMap is empty.

Definitions

maxKey(): K | undefined;

maxKey<O>(otherwise: OptLazy<O>): K | O;

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.maxKey())
// => 'd'
console.log(m.maxKey('q'))
// => 'd'
console.log(SortedMap.empty().maxKey())
// => undefined
console.log(SortedMap.empty().maxKey('q'))
// => 'q'

maxValue

Returns the value associated with the maximum key of the SortedMap, or a fallback value (default: undefined) if the SortedMap is empty.

Definitions

maxValue(): V | undefined;

maxValue<O>(otherwise: OptLazy<O>): V | O;

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.maxValue())
// => 4
console.log(m.maxValue('q'))
// => 4
console.log(SortedMap.empty().maxValue())
// => undefined
console.log(SortedMap.empty().maxValue('q'))
// => 'q'

min

Returns the entry with the minimum key of the SortedMap, or a fallback value (default: undefined) if the SortedMap is empty.

Definitions

min(): readonly [K, V] | undefined;

min<O>(otherwise: OptLazy<O>): readonly [K, V] | O;

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.min())
// => ['a', 1]
console.log(m.min('q'))
// => ['a', 1]
console.log(SortedMap.empty().min())
// => undefined
console.log(SortedMap.empty().min('q'))
// => 'q'

minKey

Returns the minimum key of the SortedMap, or a fallback value (default: undefined) if the SortedMap is empty.

Definitions

minKey(): K | undefined;

minKey<O>(otherwise: OptLazy<O>): K | O;

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.minKey())
// => 'a'
console.log(m.minKey('q'))
// => 'a'
console.log(SortedMap.empty().minKey())
// => undefined
console.log(SortedMap.empty().minKey('q'))
// => 'q'

minValue

Returns the value associated with the minimum key of the SortedMap, or a fallback value (default: undefined) if the SortedMap is empty.

Definitions

minValue(): V | undefined;

minValue<O>(otherwise: OptLazy<O>): V | O;

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.minValue())
// => 1
console.log(m.minValue('q'))
// => 1
console.log(SortedMap.empty().minValue())
// => undefined
console.log(SortedMap.empty().minValue('q'))
// => 'q'

slice

Returns a SortedMap containing only those entries whose keys are within the given keyRange.

Definition

slice(keyRange: Range<K>): SortedMap<K, V>;

Parameters

Name	Type	Description
keyRange	Range<K>	a Range defining the keys to include

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.slice({ start: 'b', end: 'c' }).toArray())
// => [['b', 2], ['c', 3]]

sliceIndex

Returns a SortedMap containing only those entries that are within the given range index range of they key sort order.

Definition

sliceIndex(range: IndexRange): SortedMap<K, V>;

Parameters

Name	Type	Description
range	IndexRange	an IndexRange defining the sort order indices to include.

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.sliceIndex({ start: 1, amount: 2 }).toArray())
// => [['b', 2], ['c', 3]]

stream

undocumented

Definition

stream(options?: {
    reversed?: boolean;
  }): Stream<readonly [K, V]>;

Parameters

Name	Type	Description
options	{     reversed?: boolean;   }

streamKeys

undocumented

Definition

streamKeys(options?: {
    reversed?: boolean;
  }): Stream<K>;

Parameters

Name	Type	Description
options	{     reversed?: boolean;   }

streamRange

Returns a Stream of sorted entries of this collection within the given keyRange.

Definition

streamRange(keyRange: Range<K>, options?: {
    reversed?: boolean;
  }): Stream<readonly [K, V]>;

Parameters

Name	Type	Description
keyRange	Range<K>	the range of keys to include in the stream
options	{     reversed?: boolean;   }	(optional) an object containing the following properties: - reversed: (default: false) when true reverses the stream element order

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]);
console.log(m.streamRange({ start: 'b', end: 'c' }).toArray())
// => ['b', 'c']

streamSliceIndex

Returns a Stream of sorted entries of this collection within the given range index range.

Definition

streamSliceIndex(range: IndexRange, options?: {
    reversed?: boolean;
  }): Stream<readonly [K, V]>;

Parameters

Name	Type	Description
range	IndexRange	the range of keys to include in the stream
options	{     reversed?: boolean;   }

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]);
console.log(m.streamSliceIndex({ start: 1, amount: 2 }).toArray())
// => [['b', 2], ['c', 3]]

streamValues

undocumented

Definition

streamValues(options?: {
    reversed?: boolean;
  }): Stream<V>;

Parameters

Name	Type	Description
options	{     reversed?: boolean;   }

take

Returns a SortedMap containing the the first amount of elements of this SortedMap.

Definition

take(amount: number): SortedMap<K, V>;

Parameters

Name	Type	Description
amount	number	the amount of elements to keep

note

a negative amount takes the last elements instead of the first, e.g. -2 is the last 2 elements

example

const m = SortedMap.of(['b', 2], ['d', 4], ['a', 1], ['c', 3]).asNormal();
console.log(m.take(2).toArray())
// => [['a', 1], ['b', 2]]
console.log(m.take(-2).toArray())
// => [['c', 3], ['d', 4]]