@rimbu/deep/dist/esm/selector.mjs

Tools to use handle plain JS objects as immutable objects

import { Deep } from './internal.mjs';
/**
 * Returns the result of applying the given `selector` shape to the given `source` value.
 * @typeparam T - the patch value type
 * @typeparam SL - the selector shape type
 * @param source - the source value to select from
 * @param selector - a shape indicating the selection from the source values
 * @example
 * ```ts
 * const item = { a: { b:  1, c: 'a' } };
 * Deep.select(item, { q: 'a.c', y: ['a.b', 'a.c'], z: (v) => v.a.b + 1 });
 * // => { q: 'a', y: [1, 'a'], z: 2 }
 * ```
 */
export function select(source, selector) {
    if (typeof selector === 'function') {
        // selector is function, resolve selector function
        return selector(source);
    }
    else if (typeof selector === 'string') {
        // selector is string path, get the value at the given path
        return Deep.getAt(source, selector);
    }
    else if (Array.isArray(selector)) {
        // selector is tuple, get each tuple item value
        return selector.map((s) => select(source, s));
    }
    // selector is object
    const result = {};
    for (const key in selector) {
        // set each selected object key to the selector value
        result[key] = select(source, selector[key]);
    }
    return result;
}
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