javascript非同期ファイル読み込みサンプル

readlineとfsはrequireするだけで使える.

test.js

test.js

var file_path = "test.txt"
var rl = require('readline').createInterface({
  input: require('fs').createReadStream( file_path ),
  terminal: false
}).on("line", function(line){
  console.log( "line: " + line )
}).on("close", function(){
  console.log( "Finished file seek" )
})

console.log("Done")

test.txt

test.txt

a
b
c
d
e
f

% node test.js
Done
line: a
line: b
line: c
line: d
line: e
line: f
Finished file seek