No error , No gain

I'm trying to create globally-unique identifiers in JavaScript. I'm not sure what routines are available on all browsers, how "random" and seeded the built-in random number generator is, etc. The GUID / UUID should be at least 32 characters and should stay in the ASCII range to avoid trouble when passing them around. For an RFC4122 version 4 compliant solution, this one-liner(ish) solution is th..

What is the difference between a function decorated with @staticmethod and one decorated with @classmethod? Maybe a bit of example code will help: Notice the difference in the call signatures of foo, class_foo and static_foo: class A(object): def foo(self, x): print(f"executing foo({self}, {x})") @classmethod def class_foo(cls, x): print(f"executing class_foo({cls}, {x})") @staticmethod def stat..

How can I horizontally center a within another using CSS? Foo foo You can apply this CSS to the inner : #inner { width: 50%; margin: 0 auto; } Of course, you don't have to set the width to 50%. Any width less than the containing will work. The margin: 0 auto is what does the actual centering. If you are targeting Internet Explorer 8 (and later), it might be better to have this instead: #inner { ..

How do I reset my local branch to be just like the branch on the remote repository? I did: git reset --hard HEAD But when I run a git status, On branch master Changes to be committed: (use "git reset HEAD ..." to unstage) modified: java/com/mycompany/TestContacts.java modified: java/com/mycompany/TestParser.java Can you please tell me why I have these 'modified'? I haven't touched these files? I..

Why does Google prepend while(1); to their (private) JSON responses? For example, here's a response while turning a calendar on and off in Google Calendar: while (1); [ ['u', [ ['smsSentFlag', 'false'], ['hideInvitations', 'false'], ['remindOnRespondedEventsOnly', 'true'], ['hideInvitations_remindOnRespondedEventsOnly', 'false_true'], ['Calendar ID stripped for privacy', 'false'], ['smsVerifiedF..

This question's answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. This question attempts to collect the few pearls among the dozens of bad C++ books that are published every year. Unlike many other programming languages, which are often picked up on the go from tutorials found on the Internet, few are able to qu..

Is there a regular expression to verify an email address in JavaScript? Using regular expressions is probably the best way. You can see a bunch of tests here (taken from chromium) function validateEmail(email) { const re = /^(([^()[\]\\.,;:\s@"]+(\.[^()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; return re.test(String(emai..

I have this string in my JavaScript code: "Test abc test test abc test test test abc test test abc" Doing: str = str.replace('abc', ''); Seems to only remove the first occurrence of abc in the string above. How can I replace all occurrences of it? As of August 2020: Modern browsers have support for the String.replaceAll() method defined by the ECMAScript 2021 language specification. For older/le..

How can I loop through all the entries in an array using JavaScript? I thought it was something like this: forEach(instance in theArray) Where theArray is my array, but this seems to be incorrect. TL;DR Your best bets are usually a for-of loop (ES2015+ only; spec | MDN) - simple and async-friendly forEach (ES5+ only; spec | MDN) (or its relatives some and such) - not async-friendly (but see deta..

I have made some changes to a file which has been committed a few times as part of a group of files, but now want to reset/revert the changes on it back to a previous version. I have done a git log along with a git diff to find the revision I need, but just have no idea how to get the file back to its former state in the past. Assuming the hash of the commit you want is c5f567: git checkout c5f5..