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How to write an async method with out parameter?
...ons. Your code can be the only documentation a developer will ever have.
Best of luck.
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How to get unique values in an array
...implementation. checking the result array to see if it already contains an item is horrible. a better approach would be to either use an object that tracks the counts, or if you dont want to use aux storage, sort it first in O(n log n) then to a linear sweep and compare side by side elements
...
targetContentOffsetForProposedContentOffset:withScrollingVelocity without subclassing UICollectionVi
...zeForItemAt:), use a custom variable with the itemSize instead.
This works best when you set self.collectionView.decelerationRate = UIScrollView.DecelerationRate.fast.
Here's a horizontal version (haven't tested it thoroughly so please forgive any mistakes):
override func targetContentOffset(forP...
Amazon SimpleDB vs Amazon DynamoDB
... NoSQL offering:
We concluded that an ideal solution would combine the best parts of
the original Dynamo design (incremental scalability, predictable high
performance) with the best parts of SimpleDB (ease of administration
of a cloud service, consistency, and a table-based data model that...
What does enumerate() mean?
...rable (like a list), as well as an index number, combined in a tuple:
for item in enumerate(["a", "b", "c"]):
print item
prints
(0, "a")
(1, "b")
(2, "c")
It's helpful if you want to loop over a sequence (or other iterable thing), and also want to have an index counter available. If you wa...
Delete keychain items when an app is uninstalled
...d
if !userDefaults.bool(forKey: "hasRunBefore") {
// Remove Keychain items here
// Update the flag indicator
userDefaults.set(true, forKey: "hasRunBefore")
}
*note that synchronize() function is deprecated
...
List comprehension in Ruby
...rk comparing the three alternatives and map-compact really seems to be the best option.
Performance test (Rails)
require 'test_helper'
require 'performance_test_help'
class ListComprehensionTest < ActionController::PerformanceTest
TEST_ARRAY = (1..100).to_a
def test_map_compact
1000....
Getting key with maximum value in dictionary?
...
You can use operator.itemgetter for that:
import operator
stats = {'a':1000, 'b':3000, 'c': 100}
max(stats.iteritems(), key=operator.itemgetter(1))[0]
And instead of building a new list in memory use stats.iteritems(). The key parameter to the...
Removing path and extension from filename in powershell
...he full path, directory, file name or file extension.
$PSCommandPath
(Get-Item $PSCommandPath ).Extension
(Get-Item $PSCommandPath ).Basename
(Get-Item $PSCommandPath ).Name
(Get-Item $PSCommandPath ).DirectoryName
(Get-Item $PSCommandPath ).FullName
$ConfigINI = (Get-Item $PSCommandPath ).Director...
What columns generally make good indexes?
...cess to which parameter narrows the search space the most, and that's your best index.
Also consider the kind of index you make -- B-trees are good for most things and allow range queries, but hash indexes get you straight to the point (but don't allow ranges). Other types of indexes have other pr...