@mzvonar/getin/dist/index.js

Get value from object by path. Undefined-safe and accepts default value

"use strict";

/**
 * Gets value from object by path. If any part of path is undefined it returns undefined or defaultValue if provided
 * @param {Object} context
 * @param {Array|string} path
 * @param {*} defaultValue
 * @return {*}
 */
module.exports = function getIn(context, path, defaultValue) {
  if (!context) {
    return defaultValue || context;
  }

  var pathType = Object.prototype.toString.call(path);

  if (pathType !== '[object Undefined]' && pathType !== '[object Array]') {
    path = [path];
  }

  if (!path || path.length === 0) {
    throw new Error('Path is not defined');
  }

  var result = context;

  for (var i = 0, length = path.length; i < length; i += 1) {
    result = result[path[i]];

    if (typeof result === 'undefined' || result === null) {
      return defaultValue;
    }
  }

  return result;
};