chinaHewei

After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
brew unlink postgresql
brew install postgresql@9.6
brew unlink postgresql@9.6
brew link postgresql

chinaHewei

2018 年一月份学习计划

• ECMAScript 6 语法
• JavaScript 运行机制
  • JavaScript Execution Context
  • JavaScript Scope Chain
  • JavaScript Event Loop
  • JavaScript this
• Docker 基本概念及使用
• Bootstrap 使用

chinaHewei

let a = 2
let b = 1
console.log(`a --> ${a}\nb --> ${b}`)

// swap a and b
a = {x: b, y: (b = a)}.x

console.log(`a --> ${a}\nb --> ${b}`)