necto/src/utils/get.js

Necto compliments Redux by providing a composable, declarative api to create flows through redux (Action -> Reducer or Action -> Saga). The intent of Necto is to reduce boilerplate, simplify and standardize action creators, and group action logic so that

// Implementation thanks to Chris Ferdinandi.
// https://gomakethings.com/how-to-get-the-value-of-an-object-from-a-specific-path-with-vanilla-js/

const get = function(obj, path, def) {
  /**
   * If the path is a string, convert it to an array
   * @param  {String|Array} path The path
   * @return {Array}             The path array
   */
  const stringToPath = function(path) {
    // If the path isn't a string, return it
    if (typeof path !== 'string') return path;

    // Create new array
    var output = [];

    // Split to an array with dot notation
    path.split('.').forEach(function(item, index) {
      // Split to an array with bracket notation
      item.split(/\[([^}]+)\]/g).forEach(function(key) {
        // Push to the new array
        if (key.length > 0) {
          output.push(key);
        }
      });
    });

    return output;
  };

  // Get the path as an array
  path = stringToPath(path);

  // Cache the current object
  var current = obj;

  // For each item in the path, dig into the object
  for (var i = 0; i < path.length; i++) {
    // If the item isn't found, return the default (or null)
    if (!current[path[i]]) return def;

    // Otherwise, update the current  value
    current = current[path[i]];
  }

  return current;
};

export default get;