akameco

// @flow
import * as React from 'react'

class Maybe extends React.Component<{
  flag: boolean,
  children?: React.Node,
  else: React.Node,
}> {
  render() {
    const { props } = this

akameco

GHQ=`ghq root`/github.com
ME=`git config --get user.name`

gcd() {
	ghq get -p $1
	if [ `dirname "$1"` = "." ]; then
		cd $GHQ/$ME/$1
	else
		cd $GHQ/$1
	fi

akameco

$ curl localhost:3000?name=tj
["express","koa","mocha","stylus","co"]

akameco

$ yarn add cli-to-api
$ yarn run cli-to-api cli.js -o server.js
$ node server.js
listening on 3000

akameco

$ yarn add mri // or minimist

akameco

$ node cli.js --name tj
[ 'express', 'koa', 'mocha', 'stylus', 'co' ]

$ chmod +x cli.js
$ cli.js --name kittens
[ 'babel', 'yarn' ]

akameco

'use strict'
const parse = require('mri') // or require('minimist')

// node cli.js --name tj
const { name } = parse(process.argv.slice(2))

const jsers = {
  tj: ['express', 'koa', 'mocha', 'stylus', 'co'],
  sindersorhus: ['ava', 'chalk', 'xo', 'yaomen'],
  rauchg: ['socket.io', 'next.js'],

akameco

$ mkdir cli-app-demo
$ cd cli-app-demo
$ yarn init -y
$ touch cli.js

akameco

try {
  await f()
} catch (err) {
  handleErr1(err)
}
try {
  await g()
} catch (err) {
  handleErr2(err)
}

akameco

let name = ‘ゲスト’
try {
  name = awiat getName()
} catch (err) { }
console.log(`ようこそ ${name}さん`)
// => ようこそ ゲストさん

/// ↓ ↓ ↓

const name = await getName().catch(() => ‘ゲスト’)