I have a loop in node.js
for (var i in files){
var all = fs.readdirsync("./0");
async.eachSeries(all, function(item){
check(item);
}
}
The check(item)
has a callback to another function.
As I can see, the async.eachSeries
doesn't execute synchronously. The loop continues to execute the other items, before the callback in the check()
function is finish.
How do I make the loop wait until the iteration is finished (including the callback)?
Assuming check
accepts a callback, we can use mapSeries
to achieve that.
async.mapSeries(files, function(file, outerCB) {
var all = fs.readdirsync("./0");
async.mapSeries(all, function(item, cb){
check(item, cb);
}, outerCB);
}, function(err, results) {
// This is called when everything's done
});
Outer loop needs to be async also. One of the the methods is to use 2 eachSeries loops or outer loop can be in parallel (each) if the files don't have to be processed in series:
var async = require('async');
async.eachSeries(files, function(file, outCb)
{
var all = fs.readFileSync(file);
async.eachSeries(all, function(item, inCb)
{
check(item);
inCb(null); // inner callback
},
function(err)
{
outCb(null); // outer callback
});
},
function(err)
{
console.log('all done!!!');
});
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