predictype/dist/cjs/predicates/maps/mapState.js

PredicType is a library of pre-built and tested predicates for TypeScript, covering various data types and operations.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.mapState = mapState;
const maps_js_1 = require("../../enums/maps.js");
/**
 * Checks the state of a Map (empty or not) using the specified operation.
 *
 * @param source The Map to check.
 * @param oper The state operation to perform (e.g. 'is_empty', 'is_not_empty').
 * @returns True if the state check is valid according to the operator, otherwise false.
 *
 * @throws {Error} If the operation is not recognized.
 *
 * @example
 * const m1 = new Map();
 * const m2 = new Map([[1, 'a']]);
 *
 * mapState(m1, 'is_empty'); // true
 * mapState(m2, 'is_not_empty'); // true
 *
 * @remarks
 * Supported Operators:
 * - **IS_EMPTY**: Map is empty
 * - **IS_NOT_EMPTY**: Map is not empty
 */
function mapState(source, oper) {
    const operators = {
        [maps_js_1.MapStateEnum.IS_EMPTY]: (a) => a.size === 0,
        [maps_js_1.MapStateEnum.IS_NOT_EMPTY]: (a) => a.size > 0,
    };
    const enumOper = typeof oper === 'string' ? oper : oper;
    const fn = operators[enumOper];
    if (!fn)
        throw new Error(`Unknown MapState operation: ${oper}`);
    return fn(source);
}