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What is “lifting” in Scala?
...ethod into a function by applying the underscore
scala> val f = times2 _
f: Int => Int = <function1>
scala> f(4)
res0: Int = 8
Note the fundamental difference between methods and functions. res0 is an instance (i.e. it is a value) of the (function) type (Int => Int)
Functors
...
Converting an int to std::string
...
You can use std::to_string in C++11
int i = 3;
std::string str = std::to_string(i);
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fo...
Using node.js as a simple web server
... Explorer
reg.exe add HKCR\Directory\shell\LightServer\command /ve /t REG_EXPAND_SZ /f /d "\"C:\nodejs\light-server.cmd\" \"-o\" \"-s\" \"%V\""
Simple JSON REST server
If you need to create a simple REST server for a prototype project then json-server might be what you're looking for.
Auto Ref...
Centering a background image, using CSS
...nd-image:url(https://upload.wikimedia.org/wikipedia/commons/thumb/8/8b/Dore_woodcut_Divine_Comedy_01.jpg/481px-Dore_woodcut_Divine_Comedy_01.jpg);
background-repeat:no-repeat;
background-position: center;
background-size: cover;
html{
height:100%
}
body{
background-image:url(https://uplo...
How to avoid 'cannot read property of undefined' errors?
...tive "in", but allows paths.
var testObject = {a: {b: {c: 'walrus'}}};
if(_.has(testObject, 'a.b.c')) {
//Safely access your walrus here
}
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Convert form data to JavaScript object with jQuery
...nction(){
var self = this,
json = {},
push_counters = {},
patterns = {
"validate": /^[a-zA-Z][a-zA-Z0-9_]*(?:\[(?:\d*|[a-zA-Z0-9_]+)\])*$/,
"key": /[a-zA-Z0-9_]+|(?=\[\])/g,
"push": /^$/,
...
Why does sudo change the PATH?
... Don't alias sudo; see answer from @Jacob about Defaults env_reset.
– greg_1_anderson
Aug 19 '12 at 18:35
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What happened to “HelveticaNeue-Italic” on iOS 7.0.3
...f (font == nil && ([UIFontDescriptor class] != nil)) {
font = (__bridge_transfer UIFont*)CTFontCreateWithName(CFSTR("HelveticaNeue-Italic"), size, NULL);
}
It is also worth noting that in the current version of Xcode (5.0.1 (5A2053)) this font is not listed as an option in the Font dro...
Listening for variable changes in JavaScript
...ers): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects#Defining_getters_and_setters
You can define an object like this, in which aInternal represents the field a:
x = {
aInternal: 10,
aListener: function(val) {},
set a(val) {
this.aInternal = val;
th...
std::unique_lock or std::lock_guard?
...
The difference is that you can lock and unlock a std::unique_lock. std::lock_guard will be locked only once on construction and unlocked on destruction.
So for use case B you definitely need a std::unique_lock for the condition variable. In case A it depends whether you need to relo...