完成后输出一次答案，而不是在每一行

Posted 2023-03-08

【中文标题】完成后输出一次答案，而不是在每一行

【英文标题】：Output the answer once when done, not on every line

【发布时间】：2022-01-21 20:25:43

【问题描述】：

我运行以下脚本并打印文件中每一行的输出，但我需要在上。有人请帮帮我

const fs = require("fs");
const readline = require("readline");
const stream = require("stream");

const filename = process.argv[2];
const instream = fs.createReadStream(filename);
const outstream = new stream();
outstream.readable = true;
outstream.writable = true;

const rl = readline.createInterface(
  input: instream,
  output: outstream,
  terminal: false,
);
const obj = ;
rl.on("line", function (line) 
  const [country] = line.split(",", 1);
  
    for (let i = 0; i < [country].length; i++)
      if (obj[country] != null) 
        obj[country] += 1;
       else 
        obj[country] = 1;
      
  
  console.log(obj);
);

【参考方案1】：

可以使用close事件，该事件在读流关闭并处理完毕后调用。

rl.on("close", function (line) 
  console.log(obj);
);