Javascript Question
How to work forEachLimit in node js
What is the working of
forEachLimitasync.forEachLimit(array,5,(item,callback)=>{
//something
},(err)=>{
//end of loop
})
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Answer Source
It works almost like async.forEach except that it doesn’t run task for all items immediately in parallel. The concurrency value is an integer that tells Async how many tasks are allowed to run simultaneously.Let’s say that our database only allows 5 connections at a time, then we simply change our code to:
app.delete('/messages/:messageIds', function(req, res, next) {
var messageIds = req.params.messageIds.split(',');
//`5` is the `concurrency` argument here
// ----------------------------↴
async.forEachLimit(messageIds, 5, function(messageId, callback) {
db.delete('messages', messageId, callback);
}, function(err) {
if (err) return next(err);
res.json({
success: true,
message: messageIds.length+' message(s) was deleted.'
});
});
});
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