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JavaScript's functional programming helper library.

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import cb from './_cb.js';
import isArrayLike from './_isArrayLike.js';
import keys from './keys.js';

// Return the results of applying the iteratee to each element.
export default function map(obj, iteratee, context) {
  iteratee = cb(iteratee, context);
  var _keys = !isArrayLike(obj) && keys(obj),
      length = (_keys || obj).length,
      results = Array(length);
  for (var index = 0; index < length; index++) {
    var currentKey = _keys ? _keys[index] : index;
    results[index] = iteratee(obj[currentKey], currentKey, obj);
  }
  return results;
}