<K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (
self: MutableHashMap<K, V>
) => MutableHashMap<K, V>
<K, V>(
self: MutableHashMap<K, V>,
key: K,
f: (value: Option.Option<V>) => Option.Option<V>
): MutableHashMap<K, V>Updates or removes the specified key using a function from the current optional value to the next optional value.
When to use
Use to decide whether to insert, update, or remove a key based on its current optional value.
Example (Updating or removing a key)
import { MutableHashMap, Option } from "effect"
const map = MutableHashMap.make(["count", 5])
// Update existing key
MutableHashMap.modifyAt(
map,
"count",
(option) => Option.map(option, (n) => n * 2)
)
console.log(MutableHashMap.get(map, "count")) // Some(10)
// Add new key
MutableHashMap.modifyAt(
map,
"new",
(option) => Option.isNone(option) ? Option.some(42) : option
)
console.log(MutableHashMap.get(map, "new")) // Some(42)
// Remove key by returning None
MutableHashMap.modifyAt(map, "count", () => Option.none())
console.log(MutableHashMap.has(map, "count")) // false
// Conditional update
MutableHashMap.modifyAt(
map,
"new",
(option) => Option.filter(option, (n) => n > 50) // Remove if <= 50
)
console.log(MutableHashMap.has(map, "new")) // false (42 <= 50)export const const modifyAt: {
<K, V>(
key: K,
f: (
value: Option.Option<V>
) => Option.Option<V>
): (
self: MutableHashMap<K, V>
) => MutableHashMap<K, V>
<K, V>(
self: MutableHashMap<K, V>,
key: K,
f: (
value: Option.Option<V>
) => Option.Option<V>
): MutableHashMap<K, V>
}
Updates or removes the specified key using a function from the current
optional value to the next optional value.
When to use
Use to decide whether to insert, update, or remove a key based on its current
optional value.
Example (Updating or removing a key)
import { MutableHashMap, Option } from "effect"
const map = MutableHashMap.make(["count", 5])
// Update existing key
MutableHashMap.modifyAt(
map,
"count",
(option) => Option.map(option, (n) => n * 2)
)
console.log(MutableHashMap.get(map, "count")) // Some(10)
// Add new key
MutableHashMap.modifyAt(
map,
"new",
(option) => Option.isNone(option) ? Option.some(42) : option
)
console.log(MutableHashMap.get(map, "new")) // Some(42)
// Remove key by returning None
MutableHashMap.modifyAt(map, "count", () => Option.none())
console.log(MutableHashMap.has(map, "count")) // false
// Conditional update
MutableHashMap.modifyAt(
map,
"new",
(option) => Option.filter(option, (n) => n > 50) // Remove if <= 50
)
console.log(MutableHashMap.has(map, "new")) // false (42 <= 50)
modifyAt: {
<function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K, function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>(key: Kkey: function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K, f: (
value: Option.Option<V>
) => Option.Option<V>
value: Option.Option<V>value: import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>) => import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>): (self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K, function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>) => interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K, function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>
<function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K, function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>(self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K, function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>, key: Kkey: function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K, f: (
value: Option.Option<V>
) => Option.Option<V>
value: Option.Option<V>value: import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>) => import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>): interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K, function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>
} = import dualdual<
<function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K, function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>(
key: Kkey: function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K,
f: (
value: Option.Option<V>
) => Option.Option<V>
value: Option.Option<V>value: import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>) => import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>
) => (self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K, function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>) => interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>K, function (type parameter) V in <K, V>(key: K, f: (value: Option.Option<V>) => Option.Option<V>): (self: MutableHashMap<K, V>) => MutableHashMap<K, V>V>,
<function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K, function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>(
self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K, function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>,
key: Kkey: function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K,
f: (
value: Option.Option<V>
) => Option.Option<V>
value: Option.Option<V>value: import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>) => import OptionOption.type Option<A> = Option.None<A> | Option.Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>
) => interface MutableHashMap<out K, out V>A mutable hash map that stores key-value pairs and supports both referential
and Effect structural equality.
When to use
Use as a mutable key-value map when in-place updates are acceptable and keys
may rely on Effect structural equality.
Details
Operations mutate the map in place. Keys that implement Equal / Hash can
be looked up structurally; other keys use normal JavaScript reference or
primitive equality.
Example (Using a mutable hash map)
import { MutableHashMap } from "effect"
// Create a mutable hash map with string keys and number values
const map: MutableHashMap.MutableHashMap<string, number> = MutableHashMap
.empty()
// Add some data
MutableHashMap.set(map, "count", 42)
MutableHashMap.set(map, "total", 100)
// Use as iterable
for (const [key, value] of map) {
console.log(`${key}: ${value}`)
}
// Output:
// count: 42
// total: 100
// Convert to array
const entries = Array.from(map)
console.log(entries) // [["count", 42], ["total", 100]]
MutableHashMap<function (type parameter) K in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>K, function (type parameter) V in <K, V>(self: MutableHashMap<K, V>, key: K, f: (value: Option.Option<V>) => Option.Option<V>): MutableHashMap<K, V>V>
>(3, (self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
key: anykey, f: (
value: Option.Option<V>
) => Option.Option<V>
const current: Option.Option<V>current = const get: {
<K>(key: K): <V>(
self: MutableHashMap<K, V>
) => Option.Option<V>
<K, V>(
self: MutableHashMap<K, V>,
key: K
): Option.Option<V>
}
self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
key: anykey)
const const result: Option.Option<V>result = f: (
value: Option.Option<V>
) => Option.Option<V>
const current: Option.Option<V>current)
if (import OptionOption.const isNone: <A>(
self: Option<A>
) => self is None<A>
Checks whether an Option is None (absent).
When to use
Use when you need to branch on an absent Option before accessing .value.
Details
- Acts as a type guard, narrowing to
None<A>
Example (Checking for None)
import { Option } from "effect"
console.log(Option.isNone(Option.some(1)))
// Output: false
console.log(Option.isNone(Option.none()))
// Output: true
isNone(const result: Option.Option<V>result)) {
if (import OptionOption.const isSome: <A>(
self: Option<A>
) => self is Some<A>
Checks whether an Option contains a value (Some).
When to use
Use when you need to branch on a present Option before accessing .value.
Details
- Acts as a type guard, narrowing to
Some<A>
Example (Checking for Some)
import { Option } from "effect"
console.log(Option.isSome(Option.some(1)))
// Output: true
console.log(Option.isSome(Option.none()))
// Output: false
isSome(const current: Option.Option<V>current)) {
const remove: {
<K>(key: K): <V>(
self: MutableHashMap<K, V>
) => MutableHashMap<K, V>
<K, V>(
self: MutableHashMap<K, V>,
key: K
): MutableHashMap<K, V>
}
self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
key: anykey)
}
return self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
const set: {
<K, V>(key: K, value: V): (
self: MutableHashMap<K, V>
) => MutableHashMap<K, V>
<K, V>(
self: MutableHashMap<K, V>,
key: K,
value: V
): MutableHashMap<K, V>
}
self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
key: anykey, const result: Option.Some<V>const result: {
_tag: "Some";
_op: "Some";
value: A;
valueOrUndefined: A;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}
self: MutableHashMap<K, V>(parameter) self: {
backing: Map<K, V>;
buckets: Map<number, NonEmptyArray<K>>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
toString: () => string;
toJSON: () => unknown;
}