node_modules/algoliasearch/src/merge.js


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var foreach = require('foreach');

module.exports = function merge(destination/* , sources */) {
  var sources = Array.prototype.slice.call(arguments);

  foreach(sources, function(source) {
    for (var keyName in source) {
      if (source.hasOwnProperty(keyName)) {
        if (typeof destination[keyName] === 'object' && typeof source[keyName] === 'object') {
          destination[keyName] = merge({}, destination[keyName], source[keyName]);
        } else if (source[keyName] !== undefined) {
          destination[keyName] = source[keyName];
        }
      }
    }
  });

  return destination;
};