namespace HashMap

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 HashMap API documentation

Companion interface: HashMap<K,V>

Interfaces

Name	Description
HashMap.Builder<K,V>	A mutable HashMap builder used to efficiently create new immutable instances. See the Map documentation and the HashMap.Builder API documentation
HashMap.Context<UK>	A context instance for a HashMap that acts as a factory for every instance of this type of collection.
HashMap.NonEmpty<K,V>	A non-empty 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 HashMap API documentation
HashMap.Types	Utility interface that provides higher-kinded types for this collection.

Static Methods

builder

Returns an empty builder instance for this type of collection and context.

Definition

builder<K extends UK, V>(): WithKeyValue<Tp, K, V>['builder'];

Type parameters

Name	Constraints	Description
K	UK
V

example

HashMap.builder<number, string>()    // => HashMap.Builder<number, string>

Overrides

Factory.builder

createContext

Returns a new HashMap context instance based on the given options.

Definition

createContext<UK>(options?: {
    hasher?: Hasher<UK>;
    eq?: Eq<UK>;
    blockSizeBits?: number;
    listContext?: List.Context;
  }): HashMap.Context<UK>;

Type parameters

Name	Description
UK	the upper key type for which the context can create instances

Parameters

Name	Type	Description
options	{     hasher?: Hasher<UK>;     eq?: Eq<UK>;     blockSizeBits?: number;     listContext?: List.Context;   }	(optional) an object containing the following properties: - hasher: (optional) a Hasher instance used to hash the map keys - eq: (optional) an Eq instance used to determine key equality - blockSizeBits: (optional) determines the maximum block size as 2 to the power of blockSizeBits - listContext: (optional) the context to use to create list instances (for collisions)

defaultContext

Returns the default context for HashMaps.

Definition

defaultContext<UK>(): HashMap.Context<UK>;

Type parameters

Name	Description
UK	the upper key type for which the context can create instances

empty

Returns the (singleton) empty instance of this type and context with given key and value types.

Definition

empty<K extends UK, V>(): WithKeyValue<Tp, K, V>['normal'];

Type parameters

Name	Constraints	Description
K	UK
V

example

HashMap.empty<number, string>()    // => HashMap<number, string>
HashMap.empty<string, boolean>()   // => HashMap<string, boolean>

Overrides

Factory.empty

from

Returns an immutable map of this type and context, containing the entries in the given sources StreamSource instances.

Definitions

from<K extends UK, V>(...sources: ArrayNonEmpty<StreamSource.NonEmpty<readonly [K, V]>>): WithKeyValue<Tp, K, V>['nonEmpty'];

from<K, V>(...sources: ArrayNonEmpty<StreamSource<readonly [K, V]>>): WithKeyValue<Tp, K, V>['normal'];

Type parameters

Name	Constraints	Description
K	UK
V

Parameters

Name	Type	Description
sources	ArrayNonEmpty<StreamSource.NonEmpty<readonly [K, V]>>	an array of StreamSource instances containing key-value entries

example

HashMap.from([[1, 'a'], [2, 'b']])    // => HashMap.NonEmpty<number, string>

Overrides

Factory.from

merge

Returns a Map containing the common keys from this map and all the given sources key-value stream sources, and as values tuples of all the corresponding values for each common key. If a source doesn't have a key, the key will be skipped.

Definitions

merge<K extends UK, I extends readonly [unknown, unknown, ...unknown[]]>(...sources: {
      [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;
    } & unknown[]): WithKeyValue<Tp, K, {
      [KT in keyof I]: I[KT];
    }>['nonEmpty'];

merge<K extends UK, I extends readonly [unknown, unknown, ...unknown[]]>(...sources: {
      [KT in keyof I]: StreamSource<readonly [K, I[KT]]>;
    } & unknown[]): WithKeyValue<Tp, K, {
      [KT in keyof I]: I[KT];
    }>['normal'];

Type parameters

Name	Constraints	Description
K	UK	the common key type
I	readonly [unknown, unknown, ...unknown[]]	the array of input source value types

Parameters

Name	Type	Description
sources	{       [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;     } & unknown[]	a non-empty set of StreamSouces containing tuples of keys and values

example

const m = HashMap.of([1, 'a'], [2, 'b'])
const m2 = HashMap.merge(m, [[2, true]], HashMap.of([2, 15]))
// type of m2: HashMap<number, [string, boolean, number]>
console.log(m2.toArray())
// => [[2, ['b', true, 15]]]

Overrides

Factory.merge

mergeAll

Returns a Map containing all keys from this map and all the given sources key-value stream sources, and as values tuples of all the corresponding values for each key. If a source doesn't have a key, the tuple will be filled with the given fillValue.

Definitions

mergeAll<O, I extends readonly [unknown, unknown, ...unknown[]], K extends UK>(fillValue: O, ...sources: {
      [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;
    } & unknown[]): WithKeyValue<Tp, K, {
      [KT in keyof I]: I[KT] | O;
    }>['nonEmpty'];

mergeAll<O, I extends readonly [unknown, unknown, ...unknown[]], K extends UK>(fillValue: O, ...sources: {
      [KT in keyof I]: StreamSource<readonly [K, I[KT]]>;
    } & unknown[]): WithKeyValue<Tp, K, {
      [KT in keyof I]: I[KT] | O;
    }>['normal'];

Type parameters

Name	Constraints	Description
O		the type of the fill value
I	readonly [unknown, unknown, ...unknown[]]	the array of input source value types
K	UK	the common key type

Parameters

Name	Type	Description
fillValue	O	the value to use for the result tuple if a source does not have a certain key
sources	{       [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;     } & unknown[]	a non-empty set of StreamSouces containing tuples of keys and values

example

const m = HashMap.of([1, 'a'], [2, 'b'])
const m2 = HashMap.mergeAll('none', m, [[2, true]], HashMap.of([3, 15]))
// type of m2: HashMap<number, [string, boolean | string, number | string]>
console.log(m2.toArray())
// => [[1, ['a', 'none', 'none']], [2, ['b', true, 'none']], [3, ['none', 'none', 15]]]

Overrides

Factory.mergeAll

mergeAllWith

Returns a Map containing all keys from this map and all the given sources key-value stream sources, and as values the result of applying the given mergeFun to the key and all the corresponding values for each key. If a source doesn't have a key, the given tuple will be filled with the given fillValue.

Definitions

mergeAllWith<I extends readonly [unknown, unknown, ...unknown[]], K extends UK>(...sources: {
      [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;
    } & unknown[]): <O, R>(fillValue: O, mergeFun: (key: K, ...values: {
      [KT in keyof I]: I[KT] | O;
    }) => R) => WithKeyValue<Tp, K, R>['nonEmpty'];

mergeAllWith<I extends readonly [unknown, unknown, ...unknown[]], K extends UK>(...sources: {
      [KT in keyof I]: StreamSource<readonly [K, I[KT]]>;
    } & unknown[]): <O, R>(fillValue: O, mergeFun: (key: K, ...values: {
      [KT in keyof I]: I[KT] | O;
    }) => R) => WithKeyValue<Tp, K, R>['normal'];

Type parameters

Name	Constraints	Description
I	readonly [unknown, unknown, ...unknown[]]	the array of input source value types
K	UK	the common key type

Parameters

Name	Type	Description
sources	{       [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;     } & unknown[]	a non-empty set of StreamSouces containing tuples of keys and values

example

const m = HashMap.of([1, 'a'], [2, 'b'])
const m2 = HashMap.mergeAllWith(
m
[[2, 'c']],
HashMap.of([3, 'd'])
)(
'q',
(key, v1, v2, v3) => `${key}${v1}${v2}${v3}`
)
// type of m2: HashMap<number, string>
console.log(m2.toArray())
// => [[1, '1aqq'], [2, '2bcq'], [3, '3qqd']]

Overrides

Factory.mergeAllWith

mergeWith

Returns a Map containing the common keys from this map and all the given sources key-value stream sources, and as values the result of applying given mergeFun to the key and values of all the corresponding values for each common key. If a source doesn't have a key, the key will be skipped.

Definitions

mergeWith<I extends readonly [unknown, unknown, ...unknown[]], K extends UK>(...sources: {
      [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;
    } & unknown[]): <R>(mergeFun: (key: K, ...values: I) => R) => WithKeyValue<Tp, K, R>['nonEmpty'];

mergeWith<I extends readonly [unknown, unknown, ...unknown[]], K extends UK>(...sources: {
      [KT in keyof I]: StreamSource<readonly [K, I[KT]]>;
    } & unknown[]): <R>(mergeFun: (key: K, ...values: I) => R) => WithKeyValue<Tp, K, R>['normal'];

Type parameters

Name	Constraints	Description
I	readonly [unknown, unknown, ...unknown[]]	the array of input source value types
K	UK	the common key type

Parameters

Name	Type	Description
sources	{       [KT in keyof I]: StreamSource.NonEmpty<readonly [K, I[KT]]>;     } & unknown[]	a non-empty set of StreamSouces containing tuples of keys and values

example

const m = HashMap.of([1, 'a'], [2, 'b'])
const m2 = HashMap.mergeWith(
m,
[[2, true]],
HashMap.of([2, 15])
)(
(key, v1, v2) => `${key}${v1}${v2}`,
)
// type of m2: HashMap<number, string>
console.log(m2.toArray())
// => [[2, '2true15']]

Overrides

Factory.mergeWith

of

Returns an immutable map of this collection type and context, containing the given entries.

Definition

of<K extends UK, V>(...entries: ArrayNonEmpty<readonly [K, V]>): WithKeyValue<Tp, K, V>['nonEmpty'];

Type parameters

Name	Constraints	Description
K	UK
V

Parameters

Name	Type	Description
entries	ArrayNonEmpty<readonly [K, V]>	a non-empty array of key-value entries

example

HashMap.of([1, 'a'], [2, 'b'])    // => HashMap.NonEmpty<number, string>

Overrides

Factory.of

reducer

Returns a Reducer that adds received tuples to an RMap and returns the RMap as a result. When a source is given, the reducer will first create an RMap from the source, and then add tuples to it.

Definition

reducer<K extends UK, V>(source?: StreamSource<readonly [K, V]>): Reducer<readonly [K, V], WithKeyValue<Tp, K, V>['normal']>;

Type parameters

Name	Constraints	Description
K	UK
V

Parameters

Name	Type	Description
source	StreamSource<readonly [K, V]>	(optional) an initial source of tuples to add to

example

const someSource = HashMap.of([1, 'a'], [2, 'b']);
const result = Stream.of([1, 'c'], [3, 'a']).reduce(HashMap.reducer(someSource))
result.toArray()   // => [[1, 'c'], [2, 'b'], [3, 'a']]

note

uses a builder under the hood. If the given source is an RMap in the same context, it will directly call .toBuilder().

Overrides

Factory.reducer