import { modify } from "https://deno.land/x/modify_via_query@1.0.7/mod.ts";
Variant 1:
State => Update => State
Example:
modify(state)(state => state.count.$set(1))
Can be curried, for example:
const m = modify({count: 0})
const add = m(state => state.count.$apply(x => x + 1))
const minus = m(state => state.count.$apply(x => x - 1))
Parameters
state: T
Returns
(update: (state: Modifiable<T, T>) => Modifiable<T, T>) => T
Variant 2:
Update => State => State
Example:
modify(state => state.count.$set(1))(state)
This variant is useful when used with function that takes
a function with the type of State -> State. Example of such function is setState or this.setState of React.
Usage example:
const [state, setState] = React.useState({count: 0})
const add = () => setState(
modify(state => state.count.$apply(x => x + 1))
)
const minus = () => setState(
modify(state => state.count.$apply(x => x - 1))
)
Parameters
update: (state: Modifiable<T, T>) => Modifiable<T, T>