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ECMAScript 6 introduced the let statement. I've heard that it's described as a local variable, but I'm still not quite sure how it behaves differently than the var keyword. What are the differences?. When should let be used instead of var? Scoping rules The main difference is scoping rules. Variables declared by var keyword are scoped to the immediate function body (hence the function scope) whi..

Why do certain random strings produce colors when entered as background colors in HTML? For example: test ...produces a document with a red background across all browsers and platforms. On the other hand, chucknorr produces a yellow background! What’s going on here? It’s a holdover from the Netscape days: Missing digits are treated as 0[...]. An incorrect digit is simply interpreted as 0. For ex..

Example (note the case): string s = "Hello world!"; String s = "Hello world!"; What are the guidelines for the use of each? And what are the differences? string is an alias in C# for System.String. So technically, there is no difference. It's like int vs. System.Int32. As far as guidelines, it's generally recommended to use string any time you're referring to an object. e.g. string place = "worl..

This question's answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. How do I revert from my current state to a snapshot made on a certain commit? If I do git log, then I get the following output: $ git log commit a867b4af366350be2e7c21b8de9cc6504678a61b` Author: Me Date: Thu Nov 4 18:59:41 2010 -0400 blah blah bla..

I don't want to rename a remote branch, as described in Rename master branch for both local and remote Git repositories. How can I rename a local branch which hasn't been pushed to a remote repository? In case you need to rename a remote branch as well: How do I rename both a Git local and remote branch name? If you want to rename a branch while pointed to any branch, do: git branch -m If you wa..

I have a function foo which makes an asynchronous request. How can I return the response/result from foo? I am trying to return the value from the callback, as well as assigning the result to a local variable inside the function and returning that one, but none of those ways actually return the response (they all return undefined or whatever the initial value of the variable result is). Example ..

What is the maximum length of a URL in different browsers? Does it differ among browsers? Is a maximum URL length part of the HTTP specification? 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. L..

Can I use comments inside a JSON file? If so, how? No. The JSON is data only, and if you include a comment, then it will be data too. You could have a designated data element called "_comment" (or something) that should be ignored by apps that use the JSON data. You would probably be better having the comment in the processes that generates/receives the JSON, as they are supposed to know what th..

I'd prefer as little formal definition as possible and simple mathematics. 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 gra..

There is a file that was being tracked by Git, but now the file is on the .gitignore list. However, that file keeps showing up in git status after it's edited. How do you force Git to completely forget about it? .gitignore will prevent untracked files from being added (without an add -f) to the set of files tracked by Git, however Git will continue to track any files that are already being track..

Somebody pushed a branch called test with git push origin test to a shared repository. I can see the branch with git branch -r. Now I'm trying to check out the remote test branch. I've tried: git checkout test which does nothing git checkout origin/test gives * (no branch). Which is confusing. How can I be on "no branch"? How do I check out a remote Git branch? With One Remote Jakub's answer act..

Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. Answers without enough detail may be edited or deleted. What is the use of the yield keyword in Python? What does it do? For example, I'm trying to understand this code1: def _get_child_candidates(self, distance, min_dist, max_dist): if self._leftchild and d..

I have two Python dictionaries, and I want to write a single expression that returns these two dictionaries, merged (i.e. taking the union). The update() method would be what I need, if it returned its result instead of modifying a dictionary in-place. >>> x = {'a': 1, 'b': 2} >>> y = {'b': 10, 'c': 11} >>> z = x.update(y) >>> print(z) None >>> x {'a': 1, 'b': 10, 'c': 11} How can I get that fin..

I'd like to move the last several commits I've committed to master to a new branch and take master back to before those commits were made. Unfortunately, my Git-fu is not strong enough yet, any help? I.e. How can I go from this master A - B - C - D - E to this? newbranch C - D - E / master A - B Moving to an existing branch If you want to move your commits to an existing branch, it will look lik..

If Python does not have a ternary conditional operator, is it possible to simulate one using other language constructs? Yes, it was added in version 2.5. The expression syntax is: a if condition else b First condition is evaluated, then exactly one of either a or b is evaluated and returned based on the Boolean value of condition. If condition evaluates to True, then a is evaluated and returned ..

Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. Answers without enough detail may be edited or deleted. What are the differences between git pull and git fetch? In the simplest terms, git pull does a git fetch followed by a git merge. You can do a git fetch at any time to update your remote-tracking branc..

This question's answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. How can I redirect the user from one page to another using jQuery or pure JavaScript? One does not simply redirect using jQuery jQuery is not necessary, and window.location.replace(...) will best simulate an HTTP redirect. window.location.replace(..

Recently, I ran some of my JavaScript code through Crockford's JSLint, and it gave the following error: Problem at line 1 character 1: Missing "use strict" statement. Doing some searching, I realized that some people add "use strict"; into their JavaScript code. Once I added the statement, the error stopped appearing. Unfortunately, Google did not reveal much of the history behind this string st..

Say I create an object as follows: let myObject = { "ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*" }; How should I remove the property regex to end up with new myObject as follows? let myObject = { "ircEvent": "PRIVMSG", "method": "newURI" }; To remove a property from an object (mutating the object), you can do it like this: delete myObject.regex; // or, delete myObject['regex'..

After reading Hidden Features and Dark Corners of C++/STL on comp.lang.c++.moderated, I was completely surprised that the following snippet compiled and worked in both Visual Studio 2008 and G++ 4.4. Here's the code: #include int main() { int x = 10; while (x --> 0) // x goes to 0 { printf("%d ", x); } } Output: 9 8 7 6 5 4 3 2 1 0 I'd assume this is C, since it works in GCC as well. Where is th..