Hello,
I am new to node.js and try to do the following:
read items from file (database entries)
for each item do expensive I/O operation (download stuff)
with the results do another expensive I/O operation (send mail)
my approach in node.js involves map from async and looks like this:
var async = require("async");
database.read(arg, function (error, results) {
async.map(results, downloadFunction, function(err, results) {
async.map(results, sendFunction, function() {
});
});
});
This does not work as expected. Particularly async.map does not work
as expected, e.g.
function small(char, callback) {
callback("error occured", char.toLowerCase());
};
async.map(["a", "b"], small, function(err, result){
console.log(err);
console.log(result);
});
results in:
error occured
[ 'a' ]
which I do not understand. As said, I am completly new to node.
Thank you.
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