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In pure functional languages, is there an algorithm to get the inverse function?
...some cases, yes! There's a beautiful paper called Bidirectionalization for Free! which discusses a few cases -- when your function is sufficiently polymorphic -- where it is possible, completely automatically to derive an inverse function. (It also discusses what makes the problem hard when the func...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
... 隐私策略和使用条款 官方QQ群483928335 #free_v { border:none; position:fixed; top:40%; left:5px; width:200px; height:500px; display: none;}@media screen and (max-width: 700px) { #free_v { top:200%; }}
How to use Morgan logger?
I cannot log with Morgan. It doesn't log info to console. The documentation doesn't tell how to use it.
10 Answers
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Git: can I suppress listing of 'modified content'/dirty submodule entries in status, diff, etc?
...gitignore file, there is a private version called exclude, located in .git/info/, which is not version handled. Is there a corresponding file for the .gitmodules file, that will let you suppress changes in the submodule only in your instance of the parent repository, without making changes to .gitmo...
Can't access object property, even though it shows up in a console log
...ah"} [i]
origKey1: "blah"
origKey2: "blah blah"
newKey1: "this info"
newKey2: "that info"
newKey3: " more info"
> *undefined*
The [i] is a little icon, when I hovered over it it said Object value at left was snapshotted when logged, value below was evaluated just now. Thats...
Why is address zero used for the null pointer?
...al if they have the value zero: I am adviced to set pointers to zero after freeing their memory, because it means freeing the pointer again isn't dangerous; when I call malloc it returns a pointer with the value zero if it can't get me memory; I use if (p != 0) all the time to make sure passed poi...
Is the size of C “int” 2 bytes or 4 bytes?
...uires 16 bits. In that case, int, is 2 bytes. However, implementations are free to go beyond that minimum, as you will see that many modern compilers make int 32-bit (which also means 4 bytes pretty ubiquitously).
The reason your book says 2 bytes is most probably because it's old. At one time, th...
Detecting an undefined object property
...be worried about undefined. (But if you are writing a code generator, feel free to use void 0.)
With how variables work out of the way, it’s time to address the actual question: object properties. There is no reason to ever use typeof for object properties. The earlier exception regarding featur...
How are ssl certificates verified?
...asing a certificate (as mentioned above), you can also create your own for free; this is referred to as a "self-signed certificate". The difference between a self-signed certificate and one that's purchased is simple: the purchased one has been signed by a Certificate Authority that your browser alr...
Is there a link to GitHub for downloading a file in the latest release of a repository?
...when it was released and the download count:
function GetLatestReleaseInfo() {
$.getJSON("https://api.github.com/repos/ShareX/ShareX/releases/latest").done(function(release) {
var asset = release.assets[0];
var downloadCount = 0;
for (var i = 0; i < release.assets.length; i...