reduce.js

'use strict';

var reduceArray = require('./array/reduce'),
    reduceObject = require('./object/reduce');

/**
 * # Reduce
 *
 * A fast `.reduce()` implementation.
 *
 * @param  {Array|Object} subject      The array or object to reduce over.
 * @param  {Function}     fn           The reducer function.
 * @param  {mixed}        initialValue The initial value for the reducer, defaults to subject[0].
 * @param  {Object}       thisContext  The context for the reducer.
 * @return {Array|Object}              The array or object containing the results.
 */
module.exports = function fastReduce (subject, fn, initialValue, thisContext) {
  if (subject instanceof Array) {
    return reduceArray(subject, fn, initialValue, thisContext);
  }
  else {
    return reduceObject(subject, fn, initialValue, thisContext);
  }
};