effect-io-ai

Package: effect
Module: Struct

Struct.evolveKeys

Transforms keys of a struct selectively using per-key functions. Keys without a corresponding function are copied unchanged.

When to use

Use when you need computed key names, such as uppercasing or prefixing.

Details

Each transform function receives the key name and must return a new PropertyKey.

Example (Renaming keys with functions)

import { pipe, Struct } from "effect"

const result = pipe(
  { name: "Alice", age: 30 },
  Struct.evolveKeys({
    name: (k) => k.toUpperCase()
  })
)
console.log(result) // { NAME: "Alice", age: 30 }

See

• renameKeys – rename keys with a static mapping
• evolve – transform values instead of keys
• evolveEntries – transform both keys and values

Signature

declare const evolveKeys: { <S extends object, E extends KeyEvolver<S>>(e: E): (self: S) => KeyEvolved<S, E>; <S extends object, E extends KeyEvolver<S>>(self: S, e: E): KeyEvolved<S, E>; }

Source

Since v4.0.0