Get a nested object value

getDotProp.js

function returnDefault(defaultReturn) {
    return typeof defaultReturn === 'undefined' ? null : defaultReturn;
}

/**
 * Usage:
 * const obj = { id: 123, name: "John Doe", info: { married: false, partner: { id: 456, name: 'Mary Brown' } } }
 * const defaultValue = '/';
 * const dotProp = 'info.partner.name'
 *
 * const nameOfPartner = getDotProp(obj, dotProp, defaultValue);
 *
 * @param {object} myObject
 * @param {string} myDotProp
 * @param {*} defaultReturn
 */
function getDotProp(myObject, myDotProp, defaultReturn) {
    try {
        // 0. Return default on invalid input
        if (typeof myDotProp !== 'string' || typeof myObject !== 'object') {
            debugger;
            return returnDefault(defaultReturn);
        }

        // 1. Extract the dot property
        const dotSplit = myDotProp.split('.');
        let dotProp = myObject;

        for (let i = 0; i < dotSplit.length; i++) {
            const currentProp = dotSplit[i];
            dotProp = dotProp[currentProp];
        }

        // 2. Return the default if dot property was undefined.
        //    Or in case everything went as expected, return the dot property
        return typeof dotProp === 'undefined' ? returnDefault(defaultReturn) : dotProp;
    } catch (e) {
        return returnDefault(defaultReturn);
    }
}

export default getDotProp;