civilizeddev

FROM golang:alpine as builder
COPY . .
RUN apk update && \
  apk upgrade && \
  apk add --no-cache ca-certificates && \
  apk add --update-cache tzdata && \
  update-ca-certificates
RUN echo "nobody:x:65534:65534:nobody:/:" > /etc_passwd
ENV GO111MODULE=on
ENV CGO_ENABLED=0

civilizeddev

case class Pack(orders: Seq[Order], orderItems: Seq[OrderItem], products: Seq[Product])

// 1. for-comprehension에서 flatMap 체이닝: 순서대로 실행된다.
for {
  orders <- orderRepository.findAll()
  orderItems <- orderItemRepository.findAll()
  products <- productRepository.findAll()
} yield Pack(orders, orderItems, products)

// 2. future를 먼저 받아놓고 flatMap 체이닝: 동시에 여러 개의 Future를 진행할 수 있지만, 코드가 많아진다.

civilizeddev

export function combination<T>(xs: T[]): Array<Array<T>> {
  return Array.from({ length: 2 ** xs.length }).map((_, i) =>
    xs.filter((_, j) => (i >>> j) & 1)
  )
}