<V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (
self: TxHashMap<K, V>
) => Effect.Effect<TxHashMap<K, A>>
<K, V, A, X>(
self: TxHashMap<K, V>,
f: (input: V, key: K) => Result<A, X>
): Effect.Effect<TxHashMap<K, A>>Combines filtering and mapping in a single operation. Applies a filter to each entry, keeping only successful results and transforming them.
Details
This function returns a new TxHashMap reference containing only the transformed entries that succeeded. The original TxHashMap is not modified.
Example (Filtering and mapping entries)
import { Effect, Option, Result, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a mixed data map
const userData = yield* TxHashMap.make(
["alice", { age: "30", role: "admin", active: true }],
["bob", { age: "invalid", role: "user", active: true }],
["charlie", { age: "25", role: "admin", active: false }],
["diana", { age: "28", role: "user", active: true }]
)
// Extract valid ages for active admin users only
const activeAdminAges = yield* TxHashMap.filterMap(
userData,
(user, username) => {
if (!user.active || user.role !== "admin") return Result.failVoid
const age = parseInt(user.age)
if (isNaN(age)) return Result.failVoid
return Result.succeed({
username,
age,
seniority: age > 27 ? "senior" : "junior"
})
}
)
const aliceData = yield* TxHashMap.get(activeAdminAges, "alice")
console.log(aliceData) // Option.some({ username: "alice", age: 30, seniority: "senior" })
const charlieData = yield* TxHashMap.get(activeAdminAges, "charlie")
console.log(charlieData) // Option.none() (not active)
// Data-last usage with pipe
const validAges = yield* userData.pipe(
TxHashMap.filterMap((user) => {
const age = parseInt(user.age)
return isNaN(age) ? Result.failVoid : Result.succeed(age)
})
)
const size = yield* TxHashMap.size(validAges)
console.log(size) // 3 (alice, charlie, diana have valid ages)
})combinators
Source effect/TxHashMap.ts:162320 lines
export const const filterMap: {
<V, K, A, X>(
f: (input: V, key: K) => Result<A, X>
): (
self: TxHashMap<K, V>
) => Effect.Effect<TxHashMap<K, A>>
<K, V, A, X>(
self: TxHashMap<K, V>,
f: (input: V, key: K) => Result<A, X>
): Effect.Effect<TxHashMap<K, A>>
}
Combines filtering and mapping in a single operation. Applies a filter to each
entry, keeping only successful results and transforming them.
Details
This function returns a new TxHashMap reference containing only the transformed
entries that succeeded. The original TxHashMap is not modified.
Example (Filtering and mapping entries)
import { Effect, Option, Result, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a mixed data map
const userData = yield* TxHashMap.make(
["alice", { age: "30", role: "admin", active: true }],
["bob", { age: "invalid", role: "user", active: true }],
["charlie", { age: "25", role: "admin", active: false }],
["diana", { age: "28", role: "user", active: true }]
)
// Extract valid ages for active admin users only
const activeAdminAges = yield* TxHashMap.filterMap(
userData,
(user, username) => {
if (!user.active || user.role !== "admin") return Result.failVoid
const age = parseInt(user.age)
if (isNaN(age)) return Result.failVoid
return Result.succeed({
username,
age,
seniority: age > 27 ? "senior" : "junior"
})
}
)
const aliceData = yield* TxHashMap.get(activeAdminAges, "alice")
console.log(aliceData) // Option.some({ username: "alice", age: 30, seniority: "senior" })
const charlieData = yield* TxHashMap.get(activeAdminAges, "charlie")
console.log(charlieData) // Option.none() (not active)
// Data-last usage with pipe
const validAges = yield* userData.pipe(
TxHashMap.filterMap((user) => {
const age = parseInt(user.age)
return isNaN(age) ? Result.failVoid : Result.succeed(age)
})
)
const size = yield* TxHashMap.size(validAges)
console.log(size) // 3 (alice, charlie, diana have valid ages)
})
filterMap: {
<function (type parameter) V in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>V, function (type parameter) K in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>K, function (type parameter) A in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>A, function (type parameter) X in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>X>(
f: (input: V, key: K) => Result<A, X>f: (input: Vinput: function (type parameter) V in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>V, key: Kkey: function (type parameter) K in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>K) => import ResultResult<function (type parameter) A in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>A, function (type parameter) X in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>X>
): (self: TxHashMap<K, V>(parameter) self: {
ref: TxRef.TxRef<HashMap.HashMap<K, V>>;
toString: () => string;
toJSON: () => unknown;
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; <…;
}
interface TxHashMap<in out K, in out V>A TxHashMap is a transactional hash map data structure that provides atomic operations
on key-value pairs within Effect transactions. It uses an immutable HashMap internally
with TxRef for transactional semantics, ensuring all operations are performed atomically.
Example (Using transactional hash maps)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional hash map
const txMap = yield* TxHashMap.make(["user1", "Alice"], ["user2", "Bob"])
// Single operations are automatically transactional
yield* TxHashMap.set(txMap, "user3", "Charlie")
const user = yield* TxHashMap.get(txMap, "user1")
console.log(user) // Option.some("Alice")
// Multi-step atomic operations
yield* Effect.tx(
Effect.gen(function*() {
const currentUser = yield* TxHashMap.get(txMap, "user1")
if (currentUser._tag === "Some") {
yield* TxHashMap.set(txMap, "user1", currentUser.value + "_updated")
yield* TxHashMap.remove(txMap, "user2")
}
})
)
const size = yield* TxHashMap.size(txMap)
console.log(size) // 2
})
The TxHashMap namespace contains type-level utilities and helper types
for working with TxHashMap instances.
Example (Reusing extracted TxHashMap types)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional inventory map
const inventory = yield* TxHashMap.make(
["laptop", { stock: 5, price: 999 }],
["mouse", { stock: 20, price: 29 }]
)
// Extract types for reuse
type ProductId = TxHashMap.TxHashMap.Key<typeof inventory> // string
type Product = TxHashMap.TxHashMap.Value<typeof inventory> // { stock: number, price: number }
type InventoryEntry = TxHashMap.TxHashMap.Entry<typeof inventory> // [string, Product]
// Use extracted types in functions
const updateStock = (id: ProductId, newStock: number) =>
TxHashMap.modify(
inventory,
id,
(product) => ({ ...product, stock: newStock })
)
yield* updateStock("laptop", 3)
})
TxHashMap<function (type parameter) K in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>K, function (type parameter) V in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>V>) => import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<interface TxHashMap<in out K, in out V>A TxHashMap is a transactional hash map data structure that provides atomic operations
on key-value pairs within Effect transactions. It uses an immutable HashMap internally
with TxRef for transactional semantics, ensuring all operations are performed atomically.
Example (Using transactional hash maps)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional hash map
const txMap = yield* TxHashMap.make(["user1", "Alice"], ["user2", "Bob"])
// Single operations are automatically transactional
yield* TxHashMap.set(txMap, "user3", "Charlie")
const user = yield* TxHashMap.get(txMap, "user1")
console.log(user) // Option.some("Alice")
// Multi-step atomic operations
yield* Effect.tx(
Effect.gen(function*() {
const currentUser = yield* TxHashMap.get(txMap, "user1")
if (currentUser._tag === "Some") {
yield* TxHashMap.set(txMap, "user1", currentUser.value + "_updated")
yield* TxHashMap.remove(txMap, "user2")
}
})
)
const size = yield* TxHashMap.size(txMap)
console.log(size) // 2
})
The TxHashMap namespace contains type-level utilities and helper types
for working with TxHashMap instances.
Example (Reusing extracted TxHashMap types)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional inventory map
const inventory = yield* TxHashMap.make(
["laptop", { stock: 5, price: 999 }],
["mouse", { stock: 20, price: 29 }]
)
// Extract types for reuse
type ProductId = TxHashMap.TxHashMap.Key<typeof inventory> // string
type Product = TxHashMap.TxHashMap.Value<typeof inventory> // { stock: number, price: number }
type InventoryEntry = TxHashMap.TxHashMap.Entry<typeof inventory> // [string, Product]
// Use extracted types in functions
const updateStock = (id: ProductId, newStock: number) =>
TxHashMap.modify(
inventory,
id,
(product) => ({ ...product, stock: newStock })
)
yield* updateStock("laptop", 3)
})
TxHashMap<function (type parameter) K in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>K, function (type parameter) A in <V, K, A, X>(f: (input: V, key: K) => Result<A, X>): (self: TxHashMap<K, V>) => Effect.Effect<TxHashMap<K, A>>A>>
<function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K, function (type parameter) V in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>V, function (type parameter) A in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>A, function (type parameter) X in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>X>(
self: TxHashMap<K, V>(parameter) self: {
ref: TxRef.TxRef<HashMap.HashMap<K, V>>;
toString: () => string;
toJSON: () => unknown;
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; <…;
}
interface TxHashMap<in out K, in out V>A TxHashMap is a transactional hash map data structure that provides atomic operations
on key-value pairs within Effect transactions. It uses an immutable HashMap internally
with TxRef for transactional semantics, ensuring all operations are performed atomically.
Example (Using transactional hash maps)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional hash map
const txMap = yield* TxHashMap.make(["user1", "Alice"], ["user2", "Bob"])
// Single operations are automatically transactional
yield* TxHashMap.set(txMap, "user3", "Charlie")
const user = yield* TxHashMap.get(txMap, "user1")
console.log(user) // Option.some("Alice")
// Multi-step atomic operations
yield* Effect.tx(
Effect.gen(function*() {
const currentUser = yield* TxHashMap.get(txMap, "user1")
if (currentUser._tag === "Some") {
yield* TxHashMap.set(txMap, "user1", currentUser.value + "_updated")
yield* TxHashMap.remove(txMap, "user2")
}
})
)
const size = yield* TxHashMap.size(txMap)
console.log(size) // 2
})
The TxHashMap namespace contains type-level utilities and helper types
for working with TxHashMap instances.
Example (Reusing extracted TxHashMap types)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional inventory map
const inventory = yield* TxHashMap.make(
["laptop", { stock: 5, price: 999 }],
["mouse", { stock: 20, price: 29 }]
)
// Extract types for reuse
type ProductId = TxHashMap.TxHashMap.Key<typeof inventory> // string
type Product = TxHashMap.TxHashMap.Value<typeof inventory> // { stock: number, price: number }
type InventoryEntry = TxHashMap.TxHashMap.Entry<typeof inventory> // [string, Product]
// Use extracted types in functions
const updateStock = (id: ProductId, newStock: number) =>
TxHashMap.modify(
inventory,
id,
(product) => ({ ...product, stock: newStock })
)
yield* updateStock("laptop", 3)
})
TxHashMap<function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K, function (type parameter) V in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>V>,
f: (input: V, key: K) => Result<A, X>f: (input: Vinput: function (type parameter) V in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>V, key: Kkey: function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K) => import ResultResult<function (type parameter) A in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>A, function (type parameter) X in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>X>
): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<interface TxHashMap<in out K, in out V>A TxHashMap is a transactional hash map data structure that provides atomic operations
on key-value pairs within Effect transactions. It uses an immutable HashMap internally
with TxRef for transactional semantics, ensuring all operations are performed atomically.
Example (Using transactional hash maps)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional hash map
const txMap = yield* TxHashMap.make(["user1", "Alice"], ["user2", "Bob"])
// Single operations are automatically transactional
yield* TxHashMap.set(txMap, "user3", "Charlie")
const user = yield* TxHashMap.get(txMap, "user1")
console.log(user) // Option.some("Alice")
// Multi-step atomic operations
yield* Effect.tx(
Effect.gen(function*() {
const currentUser = yield* TxHashMap.get(txMap, "user1")
if (currentUser._tag === "Some") {
yield* TxHashMap.set(txMap, "user1", currentUser.value + "_updated")
yield* TxHashMap.remove(txMap, "user2")
}
})
)
const size = yield* TxHashMap.size(txMap)
console.log(size) // 2
})
The TxHashMap namespace contains type-level utilities and helper types
for working with TxHashMap instances.
Example (Reusing extracted TxHashMap types)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional inventory map
const inventory = yield* TxHashMap.make(
["laptop", { stock: 5, price: 999 }],
["mouse", { stock: 20, price: 29 }]
)
// Extract types for reuse
type ProductId = TxHashMap.TxHashMap.Key<typeof inventory> // string
type Product = TxHashMap.TxHashMap.Value<typeof inventory> // { stock: number, price: number }
type InventoryEntry = TxHashMap.TxHashMap.Entry<typeof inventory> // [string, Product]
// Use extracted types in functions
const updateStock = (id: ProductId, newStock: number) =>
TxHashMap.modify(
inventory,
id,
(product) => ({ ...product, stock: newStock })
)
yield* updateStock("laptop", 3)
})
TxHashMap<function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K, function (type parameter) A in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>A>>
} = import dualdual(
2,
<function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K, function (type parameter) V in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>V, function (type parameter) A in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>A, function (type parameter) X in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>X>(
self: TxHashMap<K, V>(parameter) self: {
ref: TxRef.TxRef<HashMap.HashMap<K, V>>;
toString: () => string;
toJSON: () => unknown;
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; <…;
}
interface TxHashMap<in out K, in out V>A TxHashMap is a transactional hash map data structure that provides atomic operations
on key-value pairs within Effect transactions. It uses an immutable HashMap internally
with TxRef for transactional semantics, ensuring all operations are performed atomically.
Example (Using transactional hash maps)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional hash map
const txMap = yield* TxHashMap.make(["user1", "Alice"], ["user2", "Bob"])
// Single operations are automatically transactional
yield* TxHashMap.set(txMap, "user3", "Charlie")
const user = yield* TxHashMap.get(txMap, "user1")
console.log(user) // Option.some("Alice")
// Multi-step atomic operations
yield* Effect.tx(
Effect.gen(function*() {
const currentUser = yield* TxHashMap.get(txMap, "user1")
if (currentUser._tag === "Some") {
yield* TxHashMap.set(txMap, "user1", currentUser.value + "_updated")
yield* TxHashMap.remove(txMap, "user2")
}
})
)
const size = yield* TxHashMap.size(txMap)
console.log(size) // 2
})
The TxHashMap namespace contains type-level utilities and helper types
for working with TxHashMap instances.
Example (Reusing extracted TxHashMap types)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional inventory map
const inventory = yield* TxHashMap.make(
["laptop", { stock: 5, price: 999 }],
["mouse", { stock: 20, price: 29 }]
)
// Extract types for reuse
type ProductId = TxHashMap.TxHashMap.Key<typeof inventory> // string
type Product = TxHashMap.TxHashMap.Value<typeof inventory> // { stock: number, price: number }
type InventoryEntry = TxHashMap.TxHashMap.Entry<typeof inventory> // [string, Product]
// Use extracted types in functions
const updateStock = (id: ProductId, newStock: number) =>
TxHashMap.modify(
inventory,
id,
(product) => ({ ...product, stock: newStock })
)
yield* updateStock("laptop", 3)
})
TxHashMap<function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K, function (type parameter) V in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>V>,
f: (input: V, key: K) => Result<A, X>f: (input: Vinput: function (type parameter) V in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>V, key: Kkey: function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K) => import ResultResult<function (type parameter) A in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>A, function (type parameter) X in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>X>
): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<interface TxHashMap<in out K, in out V>A TxHashMap is a transactional hash map data structure that provides atomic operations
on key-value pairs within Effect transactions. It uses an immutable HashMap internally
with TxRef for transactional semantics, ensuring all operations are performed atomically.
Example (Using transactional hash maps)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional hash map
const txMap = yield* TxHashMap.make(["user1", "Alice"], ["user2", "Bob"])
// Single operations are automatically transactional
yield* TxHashMap.set(txMap, "user3", "Charlie")
const user = yield* TxHashMap.get(txMap, "user1")
console.log(user) // Option.some("Alice")
// Multi-step atomic operations
yield* Effect.tx(
Effect.gen(function*() {
const currentUser = yield* TxHashMap.get(txMap, "user1")
if (currentUser._tag === "Some") {
yield* TxHashMap.set(txMap, "user1", currentUser.value + "_updated")
yield* TxHashMap.remove(txMap, "user2")
}
})
)
const size = yield* TxHashMap.size(txMap)
console.log(size) // 2
})
The TxHashMap namespace contains type-level utilities and helper types
for working with TxHashMap instances.
Example (Reusing extracted TxHashMap types)
import { Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a transactional inventory map
const inventory = yield* TxHashMap.make(
["laptop", { stock: 5, price: 999 }],
["mouse", { stock: 20, price: 29 }]
)
// Extract types for reuse
type ProductId = TxHashMap.TxHashMap.Key<typeof inventory> // string
type Product = TxHashMap.TxHashMap.Value<typeof inventory> // { stock: number, price: number }
type InventoryEntry = TxHashMap.TxHashMap.Entry<typeof inventory> // [string, Product]
// Use extracted types in functions
const updateStock = (id: ProductId, newStock: number) =>
TxHashMap.modify(
inventory,
id,
(product) => ({ ...product, stock: newStock })
)
yield* updateStock("laptop", 3)
})
TxHashMap<function (type parameter) K in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>K, function (type parameter) A in <K, V, A, X>(self: TxHashMap<K, V>, f: (input: V, key: K) => Result<A, X>): Effect.Effect<TxHashMap<K, A>>A>> =>
import EffectEffect.gen(function*() {
const const currentMap: HashMap.HashMap<K, V>const currentMap: {
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;
}
import TxRefTxRef.const get: <A>(
self: TxRef<A>
) => Effect.Effect<A>
Reads the current value of the TxRef.
When to use
Use to read the current value of a TxRef.
Example (Reading transactional references)
import { Effect, TxRef } from "effect"
const program = Effect.gen(function*() {
const counter = yield* TxRef.make(42)
// Read the value within a transaction
const value = yield* Effect.tx(
TxRef.get(counter)
)
console.log(value) // 42
})
get(self: TxHashMap<K, V>(parameter) self: {
ref: TxRef.TxRef<HashMap.HashMap<K, V>>;
toString: () => string;
toJSON: () => unknown;
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; <…;
}
TxHashMap<in out K, in out V>.ref: TxRef.TxRef<HashMap.HashMap<K, V>>(property) TxHashMap<in out K, in out V>.ref: {
version: number;
pending: Map<unknown, () => void>;
value: 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; <…;
}
const filteredMap: HashMap.HashMap<K, A>const filteredMap: {
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;
}
import HashMapHashMap.filterMap(const currentMap: HashMap.HashMap<K, V>const currentMap: {
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;
}
f: (input: V, key: K) => Result<A, X>f)
return yield* const fromHashMap: <K, V>(
hashMap: HashMap.HashMap<K, V>
) => Effect.Effect<TxHashMap<K, V>>
Helper function to create a TxHashMap from an existing HashMap
fromHashMap(const filteredMap: HashMap.HashMap<K, A>const filteredMap: {
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;
}
import EffectEffect.tx)
)