WorldDownTown WorldDownTown

## Decorators.go
package main


import (
	"fmt"
	"math/rand"
	"sort"
	"time"
)

## map_filter_reduce.swift
func reduce<T,R>(list: [T], block: (([R],T) -> R?)) -> [R]? {
    var acc = [R]()
    for x in list {
        if let val = block(acc, x) {
           acc += [val]
        }
    }

    return acc
}
	func reduce<T,R>(list: [T], block: (([R],T) -> R?)) -> [R]? {
	var acc = [R]()
	for x in list {
	if let val = block(acc, x) {
	acc += [val]
	}
	}

	return acc
	}