trainingproject/node_modules/i18n-core/lookup/chain.js

A module to teach you how to module.

"use strict";

module.exports = function i18nChain() {
  var first = null,
      current;
  for (var i = 0; i<arguments.length; i++) {
    var handler = arguments[i];
    if (handler) {
      var next = {
        handler: handler
      };
      if (!first) {
        first = next;
      } else {
        current.next = next;
      }
      current = next;
    }
  }
  return {
    get: function (key) {
      var current = first;
      while (current) {
        var value = current.handler.get(key);
        if (value !== null && value !== undefined) {
          return value;
        }
        current = current.next;
      }
    }
  };
};