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Idiomatic way to wait for multiple callbacks in Node.js
...sync library. You should especially have a look at the series. Just a copy from the snippets from github page:
async.series([
function(callback){
// do some stuff ...
callback(null, 'one');
},
function(callback){
// do some more stuff ...
callback(null, '...
Check for current Node Version
...e starting the Server using npm run start script.
Found below code helpful from this question.
'use strict';
const semver = require('semver');
const engines = require('./package').engines;
const nodeVersion = engines.node;
// Compare installed NodeJs version with required NodeJs version.
if (!semv...
Efficient way to return a std::vector in c++
...not be moved; and RVO is a compiler-dependent thing! Talk about the things from 80s & 90s.
– Nawaz
Mar 11 '18 at 16:01
...
How does Access-Control-Allow-Origin header work?
...Cross-Origin Resource Sharing) header.
When Site A tries to fetch content from Site B, Site B can send an Access-Control-Allow-Origin response header to tell the browser that the content of this page is accessible to certain origins. (An origin is a domain, plus a scheme and port number.) By defa...
How many and which are the uses of “const” in C++?
..." << (void*)&b[0];
}
For the copy-constructor to make copies from const objects and temporaries:
struct MyClass {
MyClass(MyClass const& that) { /* make copy of that */ }
};
For making constants that trivially can't change
double const PI = 3.1415;
For passing arbitra...
Check status of one port on remote host [closed]
...known ip:
nmap -A 192.168.0.5/32 -p 23
For example, look for open ports from 20 to 30 on host.example.com:
nc -z host.example.com 20-30
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Custom error pages on asp.net MVC3
...hod. It's of type IController so there's absolutely nothing preventing you from calling this method. And by the way Execute was protected in the Controller class as well in MVC 3, so there's no change in this regard.
– Darin Dimitrov
Oct 7 '13 at 10:29
...
Difference between knockout View Models declared as object literals vs functions
...d observable can be bound to the appropriate value of this, even if called from a different scope.
With an object literal, you would have to do:
var viewModel = {
first: ko.observable("Bob"),
last: ko.observable("Smith"),
};
viewModel.full = ko.computed(function() {
return this.first() +...
shared_ptr to an array : should it be used?
... T[N] or T[]. So you may write
shared_ptr<int[]> sp(new int[10]);
From n4659, [util.smartptr.shared.const]
template<class Y> explicit shared_ptr(Y* p);
Requires: Y shall be a complete type. The expression delete[] p, when T is an array type, or delete p, when T is not an arr...
How to capture the “virtual keyboard show/hide” event in Android?
...m/guide/topics/resources/runtime-changes.html#HandlingTheChange
Sample:
// from the link above
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks whether a hardware keyboard is available
if (newConfig.hardKeybo...