interface HashMap.Context<UK>

A context instance for a HashMap that acts as a factory for every instance of this type of collection.

Extends: RMapBase.Context<UK,Tp>

Type parameters

Name	Description
UK	the upper key type bound for which the context can be used

Properties

_fixedKeyType

undocumented

Definition

readonly _fixedKeyType: (key: UK) => never;

Overrides

Context._fixedKeyType

_types

undocumented

Definition

readonly _types: Tp;

Overrides

Context._types

eq

An Eq instance used to check key equivalence.

Definition

readonly eq: Eq<UK>;

hasher

A Hasher instance used to hash the map keys.

Definition

readonly hasher: Hasher<UK>;

typeTag

undocumented

Definition

readonly typeTag: 'HashMap';

Overrides

Context.typeTag

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

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

isValidKey

Returns true if given obj could be a valid key in this Context.

Definition

isValidKey(obj: any): obj is UK;

Parameters

Name	Type	Description
obj	any	the object to check

example

HashMap.defaultContext().isValidKey(1)   // => true

Overrides

Context.isValidKey

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