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What does the “map” method do in Ruby?
...example:
names = ['danil', 'edmund']
# here we map one array to another, convert each element by some rule
names.map! {|name| name.capitalize } # now names contains ['Danil', 'Edmund']
names.each { |name| puts name + ' is a programmer' } # here we just do something with each element
The output:...
multi-step registration process issues in asp.net mvc (split viewmodels, single model)
...lue("StepType");
var stepType = Type.GetType((string)stepTypeValue.ConvertTo(typeof(string)), true);
var step = Activator.CreateInstance(stepType);
bindingContext.ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => step, stepType);
return step;
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How to add leading zeros?
...
Note that sprintf converts numeric to string (character).
– aL3xa
Apr 28 '11 at 8:54
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Items in JSON object are out of order using “json.dumps”?
I'm using json.dumps to convert into json like
6 Answers
6
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In Java, what is the best way to determine the size of an object?
... too many rows of data and cause OutOfMemoryError s. Each row translates into an object. Is there an easy way to find out the size of that object programmatically? Is there a reference that defines how large primitive types and object references are for a VM ?
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Getting the current Fragment instance in the viewpager
...
@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
if (getCurrentFragment() != object) {
mCurrentFragment = ((Fragment) object);
}
super.setPrimaryItem(container, position, object);
}
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How can I add a third button to an Android Alert Dialog?
...rtDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Button 1 Text", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//...
} });
alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Button 2 Text", new DialogInterface.OnClickListene...
How to get the insert ID in JDBC?
...;
statement.setString(3, user.getEmail());
// ...
int affectedRows = statement.executeUpdate();
if (affectedRows == 0) {
throw new SQLException("Creating user failed, no rows affected.");
}
try (ResultSet generatedKeys = statement.getGen...
Mapping two integers to one, in a unique and deterministic way
Imagine two positive integers A and B. I want to combine these two into a single integer C.
18 Answers
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Android, getting resource ID from string?
...hod in one of my classes. It needs to use both the id that the reference points to and also it needs the string. How should I best achieve this?
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