hack:) node的字符界面的进度展示

[hufeng]

《The go programming language》中一个非常棒的小例子的时候
一个非常不错的字符界面的进度展示

package main
  
import (
        "fmt"
        "time"
)


func main() {
        go spinner(100 * time.Millisecond)
        const n = 45
        fibN := fib(n)
        fmt.Println("\rFib(%d) = %d\n", n, fibN)
}


func spinner(delay time.Duration) {
        for {
                for _, r := range `-\|/` {
                        fmt.Printf("\r%c", r)
                        time.Sleep(delay)
                }
        }
}

func fib(n int) int {
        if n < 2 {
                return n
        } else {
                return fib(n -1) * fib(n -2)
        }
}

联想到之前想制作一个node版本的，于是照猫画虎hack一下

const delay = time => {
  return new Promise(resolve => setTimeout(resolve, time));
};

async function spinner(time) {
  while (true) {
    const flag = ['-', '\\', '|', '/'];
    for (let f of flag) {
      process.stdout.write(`\r${f}`);
      await delay(time);
    }
  }
}

spinner(60);

happy hacking 👍

[hufeng]

简单的做了个抽取
https://github.com/hufeng/simple-indicator
直接使用yarn添加依赖