monocle-ts-esm/es6/At/Record.js

A porting of scala monocle library to TypeScript

/**
 * @since 1.7.0
 */
import { At, Lens } from '..';
import { isNone } from 'fp-ts-esm/Option';
import * as R from 'fp-ts-esm/Record';
/**
 * @category constructor
 * @since 1.7.0
 */
export function atRecord() {
    return new At((k) => new Lens((r) => R.lookup(k, r), (oa) => (r) => {
        if (isNone(oa)) {
            return R.deleteAt(k)(r);
        }
        else {
            return R.insertAt(k, oa.value)(r);
        }
    }));
}