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Why does String.valueOf(null) throw a NullPointerException?
...s
How does polymorph ambiguity distinction work?
Which overload will get selected for null in Java?
Moral of the story
There are several important ones:
Effective Java 2nd Edition, Item 41: Use overloading judiciously
Just because you can overload, doesn't mean you should every time
They ...
How to succinctly write a formula with many variables from a data frame?
...kage leaps and in particular the function regsubsets()
functions for model selection. As stated in the documentation:
Model selection by exhaustive search, forward or backward stepwise, or sequential replacement
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How to ssh to vagrant without actually running “vagrant ssh”?
...lhost
To account for when you have more than one vagrant host, this will select the desired host, as well as cull blank lines from the config (using sed):
HOST=name-of-my-host
ssh $(vagrant ssh-config $HOST | sed '/^[[:space:]]*$/d' | awk 'NR>1 {print " -o "$1"="$2}') localhost
...
How do I remove version tracking from a project cloned from git?
...efer to this article for a visual guide
In the view menu on the toolbar, select Options
In the Advanced Settings section, find Hidden files and Folders under the Files and Folders list and select Show hidden files and folders
Close the options menu and you should see all hidden folders and files ...
How do I check/uncheck all checkboxes with a button using jQuery?
...ecking/unchecking the parent checkbox all the child checkboxes are getting selected/deselected also with the text of parent checkbox getting changed to checkall/uncheckall.
...
JavaScript - Getting HTML form values
... POST) you can use:
JavaScript
const formData = new FormData(document.querySelector('form'))
for (var pair of formData.entries()) {
// console.log(pair[0] + ': ' + pair[1]);
}
form-serialize (https://code.google.com/archive/p/form-serialize/)
serialize(document.forms[0]);
jQuery
$("form").serial...
When and why are database joins expensive?
...s back to mitigating the size of the working set. Joins involving properly selected keys with correctly set up indexes are cheap, not expensive, because they allow significant pruning of the result before the rows are materialised.
Materialising the result involves bulk disk reads which are the mo...
Eclipse reports rendering library more recent than ADT plug-in
...
In the Work with field, enter: https://dl-ssl.google.com/android/eclipse/
Select Developer Tools / Android Development Tools.
Click Next and complete the wizard.
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Delete files older than 3 months old in a directory using .NET
...
Here's a 1-liner lambda:
Directory.GetFiles(dirName)
.Select(f => new FileInfo(f))
.Where(f => f.LastAccessTime < DateTime.Now.AddMonths(-3))
.ToList()
.ForEach(f => f.Delete());
...
Filtering by Multiple Specific Model Properties in AngularJS (in OR relationship)
...your filter expression, as described in the API Reference. This object can selectively apply the properties you're interested in, like so:
<input ng-model="search.name">
<input ng-model="search.phone">
<input ng-model="search.secret">
<tr ng-repeat="user in users | filter:{name...