w3nl / array-helpers

module.exports = function getByKey(original, key, defaultValue) {

    const keys = key.split('.');

    let reference = original;

    while (keys.length > 0) {

        const referenceKey = keys.shift();

        if (

            reference === null ||

            reference === undefined ||

            !Object.prototype.hasOwnProperty.call(reference, referenceKey)

        ) {

            return defaultValue;

        }

        reference = reference[referenceKey];

    }

    return reference;

};