<V>(values: Iterable<V>): HashSet<V>Creates a HashSet from an iterable collection of values.
Example (Creating a HashSet from an iterable)
import { HashSet } from "effect"
const fromArray = HashSet.fromIterable(["a", "b", "c", "b", "a"])
console.log(HashSet.size(fromArray)) // 3
const fromSet = HashSet.fromIterable(new Set([1, 2, 3]))
console.log(HashSet.size(fromSet)) // 3
const fromString = HashSet.fromIterable("hello")
console.log(Array.from(fromString)) // ["h", "e", "l", "o"]constructors
Source effect/HashSet.ts:1741 lines
export const const fromIterable: <V>(
values: Iterable<V>
) => HashSet<V>
Creates a HashSet from an iterable collection of values.
Example (Creating a HashSet from an iterable)
import { HashSet } from "effect"
const fromArray = HashSet.fromIterable(["a", "b", "c", "b", "a"])
console.log(HashSet.size(fromArray)) // 3
const fromSet = HashSet.fromIterable(new Set([1, 2, 3]))
console.log(HashSet.size(fromSet)) // 3
const fromString = HashSet.fromIterable("hello")
console.log(Array.from(fromString)) // ["h", "e", "l", "o"]
fromIterable: <function (type parameter) V in <V>(values: Iterable<V>): HashSet<V>V>(values: Iterable<V>values: interface Iterable<T, TReturn = any, TNext = any>Iterable<function (type parameter) V in <V>(values: Iterable<V>): HashSet<V>V>) => interface HashSet<out Value>A HashSet is an immutable set data structure that provides efficient storage
and retrieval of unique values. It uses a HashMap internally for optimal performance.
Example (Creating and updating a HashSet)
import { HashSet } from "effect"
// Create a HashSet
const set = HashSet.make("apple", "banana", "cherry")
// Check membership
console.log(HashSet.has(set, "apple")) // true
console.log(HashSet.has(set, "grape")) // false
// Add values (returns new HashSet)
const updated = HashSet.add(set, "grape")
console.log(HashSet.size(updated)) // 4
// Remove values (returns new HashSet)
const smaller = HashSet.remove(set, "banana")
console.log(HashSet.size(smaller)) // 2
The HashSet namespace contains type-level utilities and helper types
for working with HashSet instances.
Example (Extracting value types from a HashSet)
import { HashSet } from "effect"
// Create a concrete HashSet for type extraction
const fruits = HashSet.make("apple", "banana", "cherry")
// Extract the value type for reuse
type Fruit = HashSet.HashSet.Value<typeof fruits> // string
// Use extracted type in functions
const processFruit = (fruit: Fruit) => {
return `Processing ${fruit}`
}
HashSet<function (type parameter) V in <V>(values: Iterable<V>): HashSet<V>V> = import internalinternal.const fromIterable: <V>(
values: Iterable<V>
) => internal.HashSet<V>
Referenced by 2 symbols