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JavaScript's functional programming helper library.

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define(['./_getLength'], function (_getLength) {

  // Converts lists into objects. Pass either a single array of `[key, value]`
  // pairs, or two parallel arrays of the same length -- one of keys, and one of
  // the corresponding values. Passing by pairs is the reverse of `_.pairs`.
  function object(list, values) {
    var result = {};
    for (var i = 0, length = _getLength(list); i < length; i++) {
      if (values) {
        result[list[i]] = values[i];
      } else {
        result[list[i][0]] = list[i][1];
      }
    }
    return result;
  }

  return object;

});