effect-io-ai

Package: effect
Module: MutableHashMap

MutableHashMap.set

Sets a key-value pair in the MutableHashMap, mutating the map in place. If the key already exists, its value is updated.

When to use

Use to insert a new MutableHashMap entry or replace an existing entry in place.

Example (Setting key-value pairs)

import { MutableHashMap } from "effect"

const map = MutableHashMap.empty<string, number>()

// Add new entries
MutableHashMap.set(map, "key1", 42)
MutableHashMap.set(map, "key2", 100)

console.log(MutableHashMap.get(map, "key1")) // Some(42)
console.log(MutableHashMap.size(map)) // 2

// Update existing entry
MutableHashMap.set(map, "key1", 999)
console.log(MutableHashMap.get(map, "key1")) // Some(999)

// Pipe-able version
const setKey = MutableHashMap.set("key3", 300)
setKey(map)
console.log(MutableHashMap.size(map)) // 3

See

• modify for updating an existing value with a function
• modifyAt for setting or removing based on the current optional value
• remove for deleting an entry by key

Signature

declare 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>; }

Source

Since v2.0.0