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JavaScript's functional programming helper library.

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define(['./identity', './isFunction', './isObject', './isArray', './matcher', './property', './_optimizeCb'], function (identity, isFunction, isObject, isArray, matcher, property, _optimizeCb) {

  // An internal function to generate callbacks that can be applied to each
  // element in a collection, returning the desired result — either `_.identity`,
  // an arbitrary callback, a property matcher, or a property accessor.
  function baseIteratee(value, context, argCount) {
    if (value == null) return identity;
    if (isFunction(value)) return _optimizeCb(value, context, argCount);
    if (isObject(value) && !isArray(value)) return matcher(value);
    return property(value);
  }

  return baseIteratee;

});