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What is the use of the ArraySegment class?
...er struct that does nothing but keep a reference to an array and stores an index range. A little dangerous, beware that it does not make a copy of the array data and does not in any way make the array immutable or express the need for immutability. The more typical programming pattern is to just k...
How are Python's Built In Dictionaries Implemented?
...us block of memory (sort of like an array, so you can do an O(1) lookup by index).
Each slot in the table can store one and only one entry. This is important.
Each entry in the table is actually a combination of the three values: < hash, key, value >. This is implemented as a C struct (see d...
SQL Server IN vs. EXISTS Performance
... a bit loose in that:
1) Neither explicitly mention whether a covering index is present in
the left, right, or both sides.
2) Neither takes into account the size of input left side set and
input right side set.
(The question just mentions an overall large result set).
I believ...
How do you write a migration to rename an ActiveRecord model and its table in Rails?
...change
rename_table :old_table_name, :new_table_name
end
And all of my indexes were taken care of for me. I did not need to manually update the indexes by removing the old ones and adding new ones.
And it works using the change for going up or down in regards to the indexes as well.
...
How can I update a single row in a ListView?
...tion Michelle.
You can indeed get the right view using View#getChildAt(int index). The catch is that it starts counting from the first visible item. In fact, you can only get the visible items. You solve this with ListView#getFirstVisiblePosition().
Example:
private void updateView(int index){
...
Untrack files from git temporarily
...
git update-index should do what you want
This will tell git you want to start ignoring the changes to the file
git update-index --assume-unchanged path/to/file
When you want to start keeping track again
git update-index --no-assume-un...
What does axis in pandas mean?
... value over the flattened array) , in which axis=0 along the rows (namely, index in pandas), and axis=1 along the columns. For added clarity, one may choose to specify axis='index' (instead of axis=0) or axis='columns' (instead of axis=1).
+------------+---------+--------+
| | A | ...
How to add a new row to datagridview programmatically
...s you did: row.Cells["Column2"].Value = "XYZ"; ... You have to look up the index first: row.Cells[yourDataGridView.Columns["Column2"].Index].Value = "XYZ";
– Tizz
Dec 3 '12 at 19:55
...
Bootstrap: Open Another Modal in Modal
...
Items later in the page markup have a naturally higher z-index and will stack on top of items that appeared earlier in the markup. Unless you set an explicit z-index.
– H Dog
May 18 '16 at 20:57
...
Comparing two files in linux terminal
...u prefer the diff output style from git diff, you can use it with the --no-index flag to compare files not in a git repository:
git diff --no-index a.txt b.txt
Using a couple of files with around 200k file name strings in each, I benchmarked (with the built-in timecommand) this approach vs some o...