I can’t figure out with readline, how to make it output the final result of reading lines without intermediate steps?

Question

Node.js

Help me understand, the input data is on different lines

100
200
300

the code adds a new value each time the line is read and thus displays in the console

[ '100' ]
[ '100', '200' ]
[ '100', '200', '300 ' ]

after that, all calculations are also duplicated and issued in the same format

, I don’t understand how I can force to issue an array with only total data
[ '100', '200', '300' ] , without each update

const readline = require('readline');
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

let arr = [];
rl.on('line', line => {   

let arr1 = arr.push(line);  
let  arr2=arr.slice(0); 
console.log(arr2);

}).on('close', () => {
     process.exit(0);
});