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How can I determine if a JavaScript variable is defined in a page? [duplicate]
...ariable is defined in a page? Suppose I want to check if a variable named "x" is defined in a page, if I do if(x != null) , it gives me an error.
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When deleting remote git branch “error: unable to push to unqualified destination”
... this when trying to delete a remote branch that had already been deleted. All that was needed was a prune:
git remote prune origin
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When should the volatile keyword be used in C#?
...ors and making
them synchronize main memory with their caches".
Actually, that last bit is a lie. The true semantics of volatile reads
and writes are considerably more complex than I've outlined here; in
fact they do not actually guarantee that every processor stops what it
is doing and...
How do I get the collection of Model State Errors in ASP.NET MVC?
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@DaveH Yep, you should totally check for existence first
– Alex Lyman
Dec 4 '13 at 20:03
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C# properties: how to use custom set property without private field?
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What's the difference between this and not having set at all?
– Sidhin S Thomas
Nov 11 '19 at 16:59
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“Prevent saving changes that require the table to be re-created” negative effects
...and re-create because it doesn't have to.
The problem is that enumerating all of the cases and determining which side of the line they fall on will be quite tedious.
This is why I like to use ALTER TABLE in a query window, instead of visual designers that hide what they're doing (and quite frankly...
hash function for string
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@Josepas the hash function should ideally return a size_t or other such unsigned value (such as the unsigned long in this code). The caller is responsible for taking modulo of the result to fit it to the hash table. The caller controls the table slot being hashed to; not the func...
Batch script to delete files
...re onto your desktop.
if you want to remove an entire folder like an uninstaller program you could use this.
cd C:\Users\User\Detsktop\
rd /s /q SOFTWARE
this will delete the entire folder called software and all of its files and subfolders
Make Sure You Delete The Correct Folder Cause This Does...
Proper package naming for testing with the Go language
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I forked a package and made changes, and now my tests are all trying to import the original repo instead of my forked package. With Strategy 3, I don't have to change the "github.com/original/link" to "github.com/my/fork", because it's just referencing '.' instead.
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How can I trim leading and trailing white space?
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# Returns string without leading white space
trim.leading <- function (x) sub("^\\s+", "", x)
# Returns string without trailing white space
trim.trailing <- function (x) sub("\\s+$", "", x)
# Returns string without leading or trailing white space
trim <- function (x) gsub("^\\s+|\\s+$",...