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Printing all global variables/local variables?
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Type info variables to list "All global and static variable names".
Type info locals to list "Local variables of current stack frame" (names and values), including static variables in that function.
Type info args to list "Arguments of the current stack frame" (n...
Remove empty elements from an array in Javascript
...that are falsy, which include an empty string "", 0, NaN, null, undefined, and false.
You can pass to the filter method, the Boolean constructor function, or return the same element in the filter criteria function, for example:
var filtered = array.filter(Boolean);
Or
var filtered = array.filte...
How to create a directory using nerdtree
... need to create a new directory I need to go to terminal. Is there a quick and easy way to create a directory using NERDTree.
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Do you use source control for your database items? [closed]
...d never think of writing code without version control in a million years-- and rightly so-- can somehow be completely oblivious to the need for version control around the critical databases their applications rely on. I don't know how you can call yourself a software engineer and maintain a straight...
How to lazy load images in ListView in Android
I am using a ListView to display some images and captions associated with those images. I am getting the images from the Internet. Is there a way to lazy load images so while the text displays, the UI is not blocked and images are displayed as they are downloaded?
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How to convert a number to string and vice versa in C++
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Update for C++11
As of the C++11 standard, string-to-number conversion and vice-versa are built in into the standard library. All the following functions are present in <string> (as per paragraph 21.5).
string to numeric
float stof(const s...
Updating the list view when the adapter data changes
...r()).notifyDataSetChanged();
If that doesnt work, refer to this thread:
Android List view refresh
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Versioning SQL Server database
....html. I choose not to put schema dumps in under version control as alumb and others suggest because I want an easy way to upgrade my production database.
For a web application where I'll have a single production database instance, I use two techniques:
Database Upgrade Scripts
A sequence databa...
Random record from MongoDB
I am looking to get a random record from a huge (100 million record) mongodb .
26 Answers
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How to define @Value as optional
... limited to plain strings as default values. You can use SPEL expressions, and a simple SPEL expression to return null is:
@Value("${myValue:#{null}}")
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