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Get local IP address in node.js
... an object, that maps network interface names to its properties (so that one interface can, for example, have several addresses):
'use strict';
const { networkInterfaces } = require('os');
const nets = networkInterfaces();
const results = Object.create(null); // or just '{}', an empty object
for ...
RGB to hex and hex to RGB
...GB to hex conversion and add any required zero padding:
function componentToHex(c) {
var hex = c.toString(16);
return hex.length == 1 ? "0" + hex : hex;
}
function rgbToHex(r, g, b) {
return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}
alert(rgbToHex(0, 5...
How to pass a function as a parameter in Java? [duplicate]
In Java, how can one pass a function as an argument of another function?
8 Answers
8
...
setTimeout in for-loop does not print consecutive values [duplicate]
... in the OP and in my answer, and the time delay value is the same for each one, then once that amount of time has elapsed all the timer handlers will be called one after another in rapid succession.
If what you need is for the handlers to be called at intervals, you can either use setInterval(), wh...
Python string class like StringBuilder in C#?
...
There is no one-to-one correlation. For a really good article please see Efficient String Concatenation in Python:
Building long strings in the Python
progamming language can sometimes
result in very slow running code. In
this...
How to convert an Stream into a byte[] in C#? [duplicate]
...
A bunch of concerns are mixed together in one big method. Yes, it all has to be done, but not all in one function. There's the growable byte array and there's the stream reading. Much easier to get right if they're separated.
– Daniel Earwicker
...
Using Build Flavors - Structuring source folders and build.gradle correctly
...src/main/java.
Do note that if you had 3 flavors and only wanted a custom one for flavor1, while flavor2 and flavor3 shared the same activity you could create a common source folders for those two other activities. You have total flexibility in creating new source folders and configuring the source...
MySQL ON vs USING?
...t a couple differences are noteworthy:
ON is the more general of the two. One can join tables ON a column, a set of columns and even a condition. For example:
SELECT * FROM world.City JOIN world.Country ON (City.CountryCode = Country.Code) WHERE ...
USING is useful when both tables share a colum...
View a list of recent documents in Vim
...om Vim Documentation: Starting (or :help old):
:ol[dfiles]
Then to open one of the listed files, use: '0, '1, '2, ... '9
List the files that have marks stored in the viminfo file.
:bro[wse] ol[dfiles][!]
List file names as with :oldfiles, and then prompt for a number. When the number is val...
PHP case-insensitive in_array function
...
you can use preg_grep():
$a= array(
'one',
'two',
'three',
'four'
);
print_r( preg_grep( "/ONe/i" , $a ) );
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