I recomend to use futures: http://en.wikipedia.org/wiki/Future_(programming)
Some implementations on node:
https://github.com/laverdet/node-fibers#futures
https://github.com/kriszyp/node-promise
https://github.com/nin-jin/node-jin#sod
etc
for example (run with --harmony flag):
===================================
var $= require( 'jin' ).loader()
var test= $.jin.sync2async( function test( ){
var hash= {}
void [ 'file1.csv', 'file2.csv' ]
.map( function( path ){
return $.fs.readFileSync( path ) // returns proxy-future immediately
} )
.forEach( function( content ){
String( content )
.split( /\r?\n/g )
.forEach( function( row ){
var fields= row.split( ';' )
var key= fields[ 0 ]
var val= fields[ 1 ]
hash[ key ]= val
} )
} )
console.log( hash )
} )
test()
===================================
пятница, 18 января 2013 г., 2:15:13 UTC+4 пользователь Jean-Michel Hiver
написал:
> Hello,
>
> I getting started with node.js and its asynchronous nature is making me
> wonder how to solve this problem.
>
> Consider the following piece of code:
>
> =======================
> var fs = require('fs');
> var reader = require ("buffered-reader");
> var DataReader = reader.DataReader;
>
> function test() {
> var hash = [];
> new DataReader ("./sunrise.csv", { encoding: "utf8" })
> .on ("eof", function() {
> console.log(hash);
> })
> .on ("line", function (line){
> var reg = new RegExp(";", "g");
> var fields = line.split(reg);
> var value = fields[0];
> var key = fields[1];
> hash[key] = value;
> console.log (hash[key]);
> })
> .read ();
> console.log(hash);
> }
>
> test();
> =======================
>
> console.log(hash) displays [], most probably because it gets executed
> before the ".on ("line", function (line){...}" piece...
>
> Could you let me know how to tell it to wait? What I want to do ultimately
> is load a bunch of files into an associative array and ONLY THEN do
> something with it.
>
> Any insights would be very much appreciated.
>
> Cheers
> JM
>
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