<V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (
self: TxHashMap<K, V>
) => Effect.Effect<void, E, R>
<K, V, R, E>(
self: TxHashMap<K, V>,
f: (value: V, key: K) => Effect.Effect<void, E, R>
): Effect.Effect<void, E, R>Executes a side-effect function for each entry in the TxHashMap. The function receives the value and key as parameters and can perform effects.
Example (Running effects for each entry)
import { Console, Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a log processing map
const logs = yield* TxHashMap.make(
["error.log", { size: 1024, level: "error" }],
["access.log", { size: 2048, level: "info" }],
["debug.log", { size: 512, level: "debug" }]
)
// Process each log file with side effects
yield* TxHashMap.forEach(logs, (logInfo, filename) =>
Effect.gen(function*() {
yield* Console.log(
`Processing ${filename}: ${logInfo.size} bytes, level: ${logInfo.level}`
)
if (logInfo.level === "error") {
yield* Console.log(`⚠️ Error log detected: ${filename}`)
}
}))
// Data-last usage with pipe
yield* logs.pipe(
TxHashMap.forEach((logInfo) =>
logInfo.size > 1000
? Console.log(`Large log file: ${logInfo.size} bytes`)
: Effect.void
)
)
})combinators
Source effect/TxHashMap.ts:191820 lines
export const const forEach: {
<V, K, R, E>(
f: (
value: V,
key: K
) => Effect.Effect<void, E, R>
): (
self: TxHashMap<K, V>
) => Effect.Effect<void, E, R>
<K, V, R, E>(
self: TxHashMap<K, V>,
f: (
value: V,
key: K
) => Effect.Effect<void, E, R>
): Effect.Effect<void, E, R>
}
Executes a side-effect function for each entry in the TxHashMap.
The function receives the value and key as parameters and can perform effects.
Example (Running effects for each entry)
import { Console, Effect, TxHashMap } from "effect"
const program = Effect.gen(function*() {
// Create a log processing map
const logs = yield* TxHashMap.make(
["error.log", { size: 1024, level: "error" }],
["access.log", { size: 2048, level: "info" }],
["debug.log", { size: 512, level: "debug" }]
)
// Process each log file with side effects
yield* TxHashMap.forEach(logs, (logInfo, filename) =>
Effect.gen(function*() {
yield* Console.log(
`Processing ${filename}: ${logInfo.size} bytes, level: ${logInfo.level}`
)
if (logInfo.level === "error") {
yield* Console.log(`⚠️ Error log detected: ${filename}`)
}
}))
// Data-last usage with pipe
yield* logs.pipe(
TxHashMap.forEach((logInfo) =>
logInfo.size > 1000
? Console.log(`Large log file: ${logInfo.size} bytes`)
: Effect.void
)
)
})
forEach: {
<function (type parameter) V in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>V, function (type parameter) K in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>K, function (type parameter) R in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>R, function (type parameter) E in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>E>(
f: (
value: V,
key: K
) => Effect.Effect<void, E, R>
value: Vvalue: function (type parameter) V in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>V, key: Kkey: function (type parameter) K in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>K) => import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void, function (type parameter) E in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>E, function (type parameter) R in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>R>
): (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, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>K, function (type parameter) V in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>V>) => import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void, function (type parameter) E in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>E, function (type parameter) R in <V, K, R, E>(f: (value: V, key: K) => Effect.Effect<void, E, R>): (self: TxHashMap<K, V>) => Effect.Effect<void, E, R>R>
<function (type parameter) K in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>K, function (type parameter) V in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>V, function (type parameter) R in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>R, function (type parameter) E in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>E>(
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, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>K, function (type parameter) V in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>V>,
f: (
value: V,
key: K
) => Effect.Effect<void, E, R>
value: Vvalue: function (type parameter) V in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>V, key: Kkey: function (type parameter) K in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>K) => import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void, function (type parameter) E in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>E, function (type parameter) R in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>R>
): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void, function (type parameter) E in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>E, function (type parameter) R in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>R>
} = import dualdual(
2,
<function (type parameter) K in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>K, function (type parameter) V in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>V, function (type parameter) R in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>R, function (type parameter) E in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>E>(
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, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>K, function (type parameter) V in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>V>,
f: (
value: V,
key: K
) => Effect.Effect<void, E, R>
value: Vvalue: function (type parameter) V in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>V, key: Kkey: function (type parameter) K in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>K) => import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void, function (type parameter) E in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>E, function (type parameter) R in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>R>
): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<void, function (type parameter) E in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>E, function (type parameter) R in <K, V, R, E>(self: TxHashMap<K, V>, f: (value: V, key: K) => Effect.Effect<void, E, R>): Effect.Effect<void, E, R>R> =>
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 entries: anyentries = import HashMapHashMap.toEntries(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 EffectEffect.forEach(const entries: anyentries, ([key: anykey, value: anyvalue]) => f: (
value: V,
key: K
) => Effect.Effect<void, E, R>
value: anyvalue, key: anykey))
})
)