Can I set variables to undefined or pass undefined as an argument?
I’m a bit confused about JavaScript’s `undefined` and `null` values. What does `if (!testvar)` actually do? Does it test for `undefined` and `null` or just `undefined`? Once a variable is defined ca...
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- 26 Sep at 01:11
How can I format a decimal to always show 2 decimal places?
I want to display: `49` as `49.00` and: `54.9` as `54.90` Regardless of the length of the decimal or whether there are are any decimal places, I would like to display a `Decimal` with 2 decimal places...
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- 23 Sep at 14:0
Java: Get first item from a collection
If I have a collection, such as `Collection<String> strs`, how can I get the first item out? I could just call an `Iterator`, take its first `next()`, then throw the `Iterator` away. Is there a less w...
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- 4 Nov at 02:22
Shuffle an array with python, randomize array item order with python
What's the easiest way to shuffle an array with python?
What is the best (idiomatic) way to check the type of a Python variable?
I need to know if a variable in Python is a string or a dict. Is there anything wrong with the following code? ``` if type(x) == type(str()): do_something_with_a_string(x) elif type(x) == type(d...
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- 2 Jul at 12:0
How to scale a UIImageView proportionally?
I have a UIImageView and the objective is to scale it down proportionally by giving it either a height or width. ``` UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSU...
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- 7 Aug at 13:46
How to recursively download a folder via FTP on Linux
I'm trying to ftp a folder using the command line ftp client, but so far I've only been able to use 'get' to get individual files.
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- 25 Aug at 09:47
How do you overcome the svn 'out of date' error?
I've been attempting move a directory structure from one location to another in Subversion, but I get an `Item '*' is out of date` commit error. I have the latest version checked out (so far as I c...
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- 6 Mar at 23:0
What's the best mock framework for Java?
What's the best framework for creating mock objects in Java? Why? What are the pros and cons of each framework?
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- 28 Jan at 20:5
INSTALL_FAILED_USER_RESTRICTED : android studio using redmi 4 device
[](https://i.stack.imgur.com/TsZ3Z.jpg) Got this freaky error ``` Installation failed with message Failed to finalize session : INSTALL_FAILED_USER_RESTRICTED: Install canceled by user. It is possible...
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- 17 Aug at 14:18
How do I get the output of a shell command executed using into a variable from Jenkinsfile (groovy)?
I have something like this on a Jenkinsfile (Groovy) and I want to record the stdout and the exit code in a variable in order to use the information later. ``` sh "ls -l" ``` How can I do this, es...
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- 27 Oct at 20:22
Angular HTTP GET with TypeScript error http.get(...).map is not a function in [null]
I have a problem with HTTP in Angular. I just want to `GET` a `JSON` list and show it in the view. ## Service class ``` import {Injectable} from "angular2/core"; import {Hall} from "./hall"; i...
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- 28 Nov at 04:20
Removing duplicate elements from an array in Swift
I might have an array that looks like the following: ``` [1, 4, 2, 2, 6, 24, 15, 2, 60, 15, 6] ``` Or, really, any sequence of like-typed portions of data. What I want to do is ensure that there is o...
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- 24 Sep at 17:8
Proper way to wait for one function to finish before continuing?
I have two JS functions. One calls the other. Within the calling function, I'd like to call the other, wait for that function to finish, then continue on. So, for example/pseudo code: ``` function fi...
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- 3 Feb at 01:11
What are the Android SDK build-tools, platform-tools and tools? And which version should be used?
I know this is a very rudimentary question, but to my surprise, I could not find any document about Android SDK Build-tools. Besides Android SDK Tools and Android SDK Platform-tools, there are a bunch...
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- 9 Aug at 06:51
Entity Framework. Delete all rows in table
How can I quickly remove all rows in the table using Entity Framework? I am currently using: ``` var rows = from o in dataDb.Table select o; foreach (var row in rows) { dataDb.Table.Rem...
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- 13 Feb at 07:32
What does "|=" mean? (pipe equal operator)
I tried searching using Google Search and Stack Overflow, but it didn't show up any results. I have seen this in opensource library code: ``` Notification notification = new Notification(icon, ticker...
Making HTTP Requests using Chrome Developer tools
Is there a way to make an HTTP request using the Chrome Developer tools without using a plugin like POSTER?
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- 9 Jan at 23:24
ValidateAntiForgeryToken purpose, explanation and example
Could you explain [ValidateAntiForgeryToken](http://msdn.microsoft.com/en-us/library/system.web.mvc.validateantiforgerytokenattribute%28v=vs.100%29.aspx) purpose and show me example about `ValidateAnt...
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- 25 Feb at 09:37
library not found for -lPods
I got an error when archiving a project. This is my environment. - - - The project deployment target is: ``` IPHONEOS_DEPLOYMENT_TARGET 3.2 ``` The error shows: ``` ld: library not found for -l...
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- 2 Jan at 12:57
Check if two unordered lists are equal
I'm looking for an easy (and quick) way to determine if two lists contain the same elements: For example: ``` ['one', 'two', 'three'] == ['one', 'two', 'three'] : true ['one', 'two', 'three'] == [...
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- 25 Jan at 13:7
Converting from IEnumerable to List
I want to convert from `IEnumerable<Contact>` to `List<Contact>`. How can I do this?
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- 18 Aug at 21:49
Using PowerShell to write a file in UTF-8 without the BOM
`Out-File` seems to force the BOM when using UTF-8: ``` $MyFile = Get-Content $MyPath $MyFile | Out-File -Encoding "UTF8" $MyPath ``` How can I write a file in UTF-8 with no BOM using PowerShell? ##...
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- 24 Mar at 13:53
"webxml attribute is required" error in Maven
I am getting the following error: > Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode) I have got `web.xml` in right place which is `pr...
Remove all occurrences of char from string
I can use this: ``` String str = "TextX Xto modifyX"; str = str.replace('X','');//that does not work because there is no such character '' ``` Is there a way to remove all occurrences of character ...