js object leveller

object_leveller.js

module.exports.objectLeveller = (obj, outputObj, outputPath) => {
    var outputAccObj = outputObj || {};
    var outputAccPath = outputPath || [];
    return Object.getOwnPropertyNames(obj).reduce(function (outputAccObj, key) {
        outputAccPath.push(key);
        if (typeof obj[key] === 'object' && !!obj[key]) {
            objectLeveller(obj[key], outputAccObj, outputAccPath);
        } else {
            outputAccObj[outputAccPath.join('_')] = obj[key];
        }
        outputAccPath.pop();
        return outputAccObj;
    }, outputAccObj)
};


var temp = ['a', 'b', 'c'];
var obj = {
    'a': 1,
    'b': 2,
    'c': 3,
    'd': 4
};
var em = {};
temp.map(key => {
    em[key] = obj.hasOwnProperty(key) ? obj[key] : '';
    delete obj[key];
})