couzic / immutable-lens Goto Github PK

const updater: Updater<Source> = lens.set(newValue)

const updatedSource: Source = lens.set(newValue, source)

pick<K extends keyof Target>(...keys: K[]): (from:Target) => Pick<Target, K> {
   ...
}

{
 0: {0: 1, 1: 0, 2: 0},
 1: [0, 0, 0]
}

const state$: Observable<State> = ...
const lens = createLens<State>

const a$: Observable<A> = state$.map(state => lens.focusOn('a').read(state))

const a$: Observable<A> = state$.map(lens.focusOn('a').read)

const switchValues = lens.updateFieldValues(state => ({
   prop1: state.prop2,
   prop2: state.prop1
}))

const switchValues = lens.update(state => ({
   ...state,
   prop1: state.prop2,
   prop2: state.prop1
}))

const selector: (source: Source) => Target = lens.view()

const target: Target = lens.view(source)