如何使用startup架构
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每天学点算法
幂集 | Power Set
一个集合的幂集是它所有子集的集合。写一个函数,给定一个集合,生成它的幂集。
The power set of a set is the set of all its subsets. Write a function that, given a set, generates its power set.
For example, given the set {1, 2, 3}
, it should return {{}, {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3}}
.
# https://tutorialspoint.dev/algorithm/mathematical-algorithms/power-set # python3 program for power set import math; def printPowerSet(set,set_size): # set_size of power set of a set # with set_size n is (2**n -1) pow_set_size = (int) (math.pow(2, set_size)); counter = 0; j = 0; # Run from counter 000..0 to 111..1 for counter in range(0, pow_set_size): for j in range(0, set_size): # Check if jth bit in the # counter is set If set then # print jth element from set if((counter & (1 << j)) > 0): print(set[j], end = ""); print(""); # Driver program to test printPowerSet set = ['a', 'b', 'c']; printPowerSet(set, 3); # This code is contributed by mits.
每天学点Golang
使用GORM和GIN在Golang中实现简单分页功能
原文:Implement Pagination In Golang Using GORM and GIN
The packages you need to install in our project is:
go get github.com/go-sql-driver/MySQL go get github.com/gin-gonic/gin go get github.com/jinzhu/gorm
目录结构
- /first-api - /Config - /Controllers - /Model - /Routes - go.mod - go.sum - main.go
核心分页部分。
config.go: DB实例
repo.go
import ( "first/src/first-api/Config" models "first/src/first-api/Model" ) func GetAllUsers(user *models.User, pagination *models.Pagination) (*[]models.User, error) { var users []models.User offset := (pagination.Page - 1) * pagination.Limit queryBuider := Config.DB.Limit(pagination.Limit).Offset(offset).Order(pagination.Sort) result := queryBuider.Model(&models.User{}).Where(user).Find(&users) if result.Error != nil { msg := result.Error return nil, msg } return &users, nil }
其他值得阅读
一个startup架构概览
原文:Architecture for a startup
静态前台(Static web app):
S3 + CloudFront cdn + Route53
后台(Backend production system)
EC2(auto-scaling group)+ AWS ElasticCache + MySQL (RDS) + ALB + Cognito
分析(Analytics system)
Metabase + ALB + Cognito
监视(Monitoring)
NewRelic free tier + self-hosted Sentry server
部署(deployment)
Jenkins
Terraform is used for infrastructure as code
Ansible is used as configuration management.
我的妈妈在用Arch Linux
原文:My Mom Uses Arch Linux
This gist covers the whole step-by-step procedure I followed to get it up and running.
Desktop Environment: Cinnamon
Window Manager: Mutter
File Manager: Nemo
Video Player: mpv
Image Viewer: feh
Browser: Firefox
大规模Vue.js应用的4个最佳实践
原文:4 Best Practices for Large Scale Vue.js Projects
Use Vue Slots
F.I.R.S.T principle: Build & share independent components
Bit
well organized VUEX Store
└── store ├── index.js ├── actions.js ├── mutations.js └── modules
Unit Tests
Jest, Karma, or Mocha
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