JSON -> Map

json-to-map.ts

// const { performance } = require('perf_hooks'); // for node.js

function map(strings, ...values) {
    const innerMapsMap = new Map<string, Map<any, any>>();
    
    let str = ''
    strings.forEach((string, i) => {
        if (values[i] instanceof Map) 
        {
            const key = `__innerMap_${performance.now()}`
            innerMapsMap.set(key, values[i]);
            str += string + key;
        } else if (values[i] === undefined) {
            str += string;
        }
    })

    const obj = JSON.parse(str);

    const mapify = (obj) => {
        const map = new Map();

        for (const key in obj) {
            if (obj.hasOwnProperty(key)) {
                if (typeof obj[key] === 'object' && obj[key] !== null) {
                    map.set(key, mapify(obj[key]));
                } else if (typeof obj[key] === 'string' && obj[key].startsWith('__innerMap_')) {
                    map.set(key, innerMapsMap.get(obj[key]));
                } else if (key.startsWith('__innerMap_')) {
                    map.set(innerMapsMap.get(key), obj[key]);
                } else {
                    map.set(key, obj[key]);
                }
            }
        }

        return map;
    }

    return mapify(obj);

}