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This commit is contained in:
Julien Valverdé
2026-03-24 11:51:38 +01:00
parent 2646e295d9
commit f1d0771356
2 changed files with 19 additions and 19 deletions
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20
packages/effect-fc/src/Lens.test.ts
View File

@@ -4,12 +4,12 @@ import * as Lens from "./Lens.js"
describe("Lens", () => {
test("mapField focuses a nested property without touching other fields", async () => {
test("focusField focuses a nested property without touching other fields", async () => {
const [initialCount, updatedState] = await Effect.runPromise(
Effect.flatMap(
SubscriptionRef.make({ count: 1, label: "original" }),
parent => {
const countLens = Lens.mapField(Lens.fromSubscriptionRef(parent), "count")
const countLens = Lens.focusField(Lens.fromSubscriptionRef(parent), "count")
return Effect.flatMap(
Lens.get(countLens),
count => Effect.flatMap(
@@ -25,13 +25,13 @@ describe("Lens", () => {
expect(updatedState).toEqual({ count: 6, label: "original" })
})
test("mapMutableField preserves the root identity when mutating in place", async () => {
test("focusMutableField preserves the root identity when mutating in place", async () => {
const original = { detail: "keep" }
const updated = await Effect.runPromise(
Effect.flatMap(
SubscriptionRef.make(original),
parent => {
const detailLens = Lens.mapMutableField(Lens.fromSubscriptionRef(parent), "detail")
const detailLens = Lens.focusMutableField(Lens.fromSubscriptionRef(parent), "detail")
return Effect.flatMap(
Lens.set(detailLens, "mutated"),
() => parent.get,
@@ -44,12 +44,12 @@ describe("Lens", () => {
expect(updated.detail).toBe("mutated")
})
test("mapArrayAt updates the selected index", async () => {
test("focusArrayAt updates the selected index", async () => {
const updated = await Effect.runPromise(
Effect.flatMap(
SubscriptionRef.make([10, 20, 30]),
parent => {
const elementLens = Lens.mapArrayAt(Lens.fromSubscriptionRef(parent), 1)
const elementLens = Lens.focusArrayAt(Lens.fromSubscriptionRef(parent), 1)
return Effect.flatMap(
Lens.update(elementLens, value => value + 5),
() => parent.get,
@@ -61,13 +61,13 @@ describe("Lens", () => {
expect(updated).toEqual([10, 25, 30])
})
test("mapMutableArrayAt mutates the array reference in place", async () => {
test("focusMutableArrayAt mutates the array reference in place", async () => {
const original = ["foo", "bar"]
const updated = await Effect.runPromise(
Effect.flatMap(
SubscriptionRef.make(original),
parent => {
const elementLens = Lens.mapMutableArrayAt(Lens.fromSubscriptionRef(parent), 0)
const elementLens = Lens.focusMutableArrayAt(Lens.fromSubscriptionRef(parent), 0)
return Effect.flatMap(
Lens.set(elementLens, "baz"),
() => parent.get,
@@ -80,12 +80,12 @@ describe("Lens", () => {
expect(updated).toEqual(["baz", "bar"])
})
test("mapChunkAt replaces the focused chunk element", async () => {
test("focusChunkAt replaces the focused chunk element", async () => {
const updated = await Effect.runPromise(
Effect.flatMap(
SubscriptionRef.make(Chunk.make(1, 2, 3) as Chunk.Chunk<number>),
parent => {
const elementLens = Lens.mapChunkAt(Lens.fromSubscriptionRef(parent), 2)
const elementLens = Lens.focusChunkAt(Lens.fromSubscriptionRef(parent), 2)
return Effect.flatMap(
Lens.set(elementLens, 99),
() => parent.get,

18
packages/effect-fc/src/Lens.ts
View File

@@ -157,7 +157,7 @@ export const mapStream: {
}))
export const mapField: {
export const focusField: {
<A extends object, K extends keyof A, ER, EW, RR, RW>(
self: Lens<A, ER, EW, RR, RW>,
key: K,
@@ -174,7 +174,7 @@ export const mapField: {
(a, b) => Object.setPrototypeOf({ ...a, [key]: b }, Object.getPrototypeOf(a)),
))
export declare namespace mapMutableField {
export declare namespace focusMutableField {
export type WritableKeys<T> = {
[K in keyof T]-?: IfEquals<
{ [P in K]: T[K] },
@@ -187,20 +187,20 @@ export declare namespace mapMutableField {
type IfEquals<X, Y, A = X, B = never> = (<T>() => T extends X ? 1 : 2) extends (<T>() => T extends Y ? 1 : 2) ? A : B
}
export const mapMutableField: {
<A extends object, K extends mapMutableField.WritableKeys<A>, ER, EW, RR, RW>(
export const focusMutableField: {
<A extends object, K extends focusMutableField.WritableKeys<A>, ER, EW, RR, RW>(
self: Lens<A, ER, EW, RR, RW>,
key: K,
): Lens<A[K], ER, EW, RR, RW>
<A extends object, K extends mapMutableField.WritableKeys<A>, ER, EW, RR, RW>(
<A extends object, K extends focusMutableField.WritableKeys<A>, ER, EW, RR, RW>(
key: K,
): (self: Lens<A, ER, EW, RR, RW>) => Lens<A[K], ER, EW, RR, RW>
} = Function.dual(2, <A extends object, K extends mapMutableField.WritableKeys<A>, ER, EW, RR, RW>(
} = Function.dual(2, <A extends object, K extends focusMutableField.WritableKeys<A>, ER, EW, RR, RW>(
self: Lens<A, ER, EW, RR, RW>,
key: K,
): Lens<A[K], ER, EW, RR, RW> => map(self, a => a[key], (a, b) => { a[key] = b; return a }))
export const mapArrayAt: {
export const focusArrayAt: {
<A extends readonly any[], ER, EW, RR, RW>(
self: Lens<A, ER, EW, RR, RW>,
index: number,
@@ -217,7 +217,7 @@ export const mapArrayAt: {
(a, b) => Array.replaceOption(a, index, b) as any,
))
export const mapMutableArrayAt: {
export const focusMutableArrayAt: {
<A, ER, EW, RR, RW>(
self: Lens<A[], ER, EW, RR, RW>,
index: number,
@@ -237,7 +237,7 @@ export const mapMutableArrayAt: {
),
))
export const mapChunkAt: {
export const focusChunkAt: {
<A, ER, EW, RR, RW>(
self: Lens<Chunk.Chunk<A>, ER, EW, RR, RW>,
index: number,