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Look up all descendants of a class in Ruby
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For extra safety one should write ObjectSpace.each_object(::Class) - this will keep the code working when you happen to have a YourModule::Class defined.
– Rene Saarsoo
Oct 3 '11 at 10:42
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Convert string to variable name in JavaScript
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Javascript has an eval() function for such occasions:
function (varString) {
var myVar = eval(varString);
// .....
}
Edit: Sorry, I think I skimmed the question too quickly. This will only get you the variable, to set it you need
function SetTo5(varString) {
var newValue = 5;
eva...
Web API Routing - api/{controller}/{action}/{id} “dysfunctions” api/{controller}/{id}
...ltAction")] //Map Action and you can name your method with any text
public string Get(int id)
{
return "object of id id";
}
[HttpGet]
public IEnumerable<string> ByCategoryId(int id)
{
return new string[] { "byCategory1", "byCategory2" };
}
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“cannot resolve symbol R” in Android Studio
... xml files.
Clean Project.
This is it.
For example I had an entry in my strings.xml:
<string name="A">Some text</string>
And in activity_main.xml I used this string entry
<TextView
android:id="@+id/textViewA"
android:text="@string/A"/>
While'd been working with project, I ...
Show percent % instead of counts in charts of categorical variables
... shows what additional columns are added to the data frame by ggplot2. All extra columns are of the form ..variable...
– Ramnath
May 17 '14 at 13:42
1
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Iterating through a JSON object
...he list contains two dicts. The dicts contain various key/value pairs, all strings. When you do json_object[0], you're asking for the first dict in the list. When you iterate over that, with for song in json_object[0]:, you iterate over the keys of the dict. Because that's what you get when you iter...
'printf' vs. 'cout' in C++
...t use different syntax. printf uses standard function syntax using pattern string and variable-length argument lists. Actually, printf is a reason why C has them - printf formats are too complex to be usable without them. However, std::cout uses a different API - the operator << API that retur...
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
... <- DT[,new:=1L]
because the RHS already changed DT by reference. The extra DT <- is to misunderstand what := does. You can write it there, but it's superfluous.
DT is changed by reference, by :=, EVEN WITHIN FUNCTIONS :
f <- function(X){
X[,new2:=2L]
return("something else")
}...
How can I initialize base class member variables in derived class constructor?
...ase from Member idiom. It's not a code free solution, you'd have to add an extra layer of inheritance, but it gets the job done. To avoid boilerplate code you could use boost's implementation
share
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How can I view the shared preferences file using Android Studio?
...TextView;
prefTextView = (TextView) findViewById(R.id.tv_pref);
Map<String, ?> prefs = PreferenceManager.getDefaultSharedPreferences(
context).getAll();
for (String key : prefs.keySet()) {
Object pref = prefs.get(key);
String printVal = "";
if (pref ...