Code coverage report for nodash/lib/coll/extra.js

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/* vim: set et sw=2 ts=2: */
'use strict';
 
module.exports = [ 'List', 'Thunk', 'emptyList', 'isUndefined', 'listToArray', 'typeOf', 'error',
  function (List, Thunk, emptyList, isUndefined, listToArray, typeOf, error) {
 
  var Nodash = this;
 
  var sjt = require('steinhaus-johnson-trotter');
 
  function generateList(thing) {
    var generator = sjt(thing);
 
    function gen() {
      return new Thunk(function () {
        var next = generator();
        if (isUndefined(next)) {
          return emptyList();
        }
        return new List(next, gen());
      });
    }
 
    return new List(thing, gen());
  }
 
  return {
 
    permutations: function (thing) {
      switch (typeOf(thing)) {
        case 'array':
        case 'string':
          return sjt.all(thing);
        case 'list':
          return generateList(listToArray(thing));
        default:
          error(TypeError);
      }
    }
 
  };
  
}];