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UITextField text change event
...ment's answer is spot on.
The above can be done in interface builder too by right-clicking on the UITextField and dragging the "Editing Changed" send event to your subclass unit.
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improv...
How do you rotate a two dimensional array?
Inspired by Raymond Chen's post , say you have a 4x4 two dimensional array, write a function that rotates it 90 degrees. Raymond links to a solution in pseudo code, but I'd like to see some real world stuff.
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Cannot instantiate the type List [duplicate]
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List can be instantiated by any class implementing the interface.By this way,Java provides us polymorphic behaviour.See the example below:
List<String> list = new ArrayList<String>();
Instead of instantiating an ArrayList directly,I am...
Accessing last x characters of a string in Bash
...o up to length characters of parameter starting at the character
specified by offset. If length is omitted, expands to the substring of parameter
starting at the character specified by offset. length and offset are arithmetic
expressions (see Shell Arithmetic). This is referred to as Substring Expan...
git stash blunder: git stash pop and ended up with merge conflicts
...to the HEAD commit to reverse 2. and to clean up working tree changes made by 2. and 3.; git-reset --hard can be used for this.
Resolve the conflicts. Git will mark the conflicts in the working tree. Edit the files into shape and git add them to the index. Use git commit to seal the deal.
And un...
What is the best way to auto-generate INSERT statements for a SQL Server table?
...nd while testing, we will need a bunch of dummy data. I've added that data by using MS Access to dump excel files into the relevant tables.
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Transfer-Encoding: gzip vs. Content-Encoding: gzip
...the realms of the spec and might run into issues such as the one mentioned by Fielding as well as others, e.g. when caching proxies are involved.
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What's the role of adapters in Android?
...ay a list in your Android app.
For this you will use the ListView provided by Android.
ListViews don’t actually contain any data themselves.
It’s just a UI element without data in it.
You can populate your ListViews by using an Android adapter.
Adapter is an interface whose implementations prov...
How to shift a column in Pandas DataFrame
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You need to use df.shift here.
df.shift(i) shifts the entire dataframe by i units down.
So, for i = 1:
Input:
x1 x2
0 206 214
1 226 234
2 245 253
3 265 272
4 283 291
Output:
x1 x2
0 Nan Nan
1 206 214
2 226 234
3 245 253
4 265 272
So,...
What is the use of “assert” in Python?
...s has been pointed out above, in Python 3, assert is still a statement, so by analogy with print(..), one may extrapolate the same to assert(..) or raise(..) but you shouldn't.
This is important because:
assert(2 + 2 == 5, "Houston we've got a problem")
won't work, unlike
assert 2 + 2 == 5, "Ho...