Native deep cloning There’s now a JS standard called “structured cloning”, that works experimentally in Node 11 and later, will land in browsers, and which has polyfills for existing systems. structuredClone(value) If needed, loading the polyfill first: import structuredClone from ‘@ungap/structured-clone’; See this answer for more details. Older answers Fast cloning with data loss – … Read more
As of August 2020: Modern browsers have support for the String.replaceAll() method defined by the ECMAScript 2021 language specification. For older/legacy browsers: function escapeRegExp(string) { return string.replace(/[.*+?^${}()|[\]\\]/g, ‘\\$&’); // $& means the whole matched string } function replaceAll(str, find, replace) { return str.replace(new RegExp(escapeRegExp(find), ‘g’), replace); } Here is how this answer evolved: str = … Read more
Try: git mergetool It opens a GUI that steps you through each conflict, and you get to choose how to merge. Sometimes it requires a bit of hand editing afterwards, but usually it’s enough by itself. It is much better than doing the whole thing by hand certainly. As per Josh Glover’s comment: [This command] … Read more
Quick note, my answer is almost certainly confusing Big Oh notation (which is an upper bound) with Big Theta notation “Θ” (which is a two-side bound). But in my experience, this is actually typical of discussions in non-academic settings. Apologies for any confusion caused. BigOh complexity can be visualized with this graph: The simplest definition … Read more
In Git 1.7.0 and later, you can checkout a new branch: git checkout -b <branch> Edit files, add and commit. Then push with the -u (short for –set-upstream) option: git push -u origin <branch> Git will set up the tracking information during the push.
On Python ≥ 3.5, use pathlib.Path.mkdir: from pathlib import Path Path(“/my/directory”).mkdir(parents=True, exist_ok=True) For older versions of Python, I see two answers with good qualities, each with a small flaw, so I will give my take on it: Try os.path.exists, and consider os.makedirs for the creation. import os if not os.path.exists(directory): os.makedirs(directory) As noted in comments … Read more
Using regular expressions is probably the best way. You can see a bunch of tests here (taken from chromium) const validateEmail = (email) => { return String(email) .toLowerCase() .match( /^(([^<>()[\]\\.,;:\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,}))$/ ); }; Here’s the example of a regular expression that accepts unicode: const re = /^(([^<>()[\]\.,;:\s@\”]+(\.[^<>()[\]\.,;:\s@\”]+)*)|(\”.+\”))@(([^<>()[\]\.,;:\s@\”]+\.)+[^<>()[\]\.,;:\s@\”]{2,})$/i; But keep in mind that one should not rely … Read more
Assuming the hash of the commit you want is c5f567: git checkout c5f567 — file1/to/restore file2/to/restore The git checkout man page gives more information. If you want to revert to the commit before c5f567, append ~1 (where 1 is the number of commits you want to go back, it can be anything): git checkout c5f567~1 … Read more
TL;DR Your best bets are usually a for-of loop (ES2015+ only; spec | MDN) – simple and async-friendly for (const element of theArray) { // …use `element`… } forEach (ES5+ only; spec | MDN) (or its relatives some and such) – not async-friendly (but see details) theArray.forEach(element => { // …use `element`… }); a simple … Read more
Short answer – de facto limit of 2000 characters If you keep URLs under 2000 characters, they’ll work in virtually any combination of client and server software. If you are targeting particular browsers, see below for more details on specific limits. Longer answer – first, the standards… RFC 2616 (Hypertext Transfer Protocol HTTP/1.1) section 3.2.1 … Read more