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Most efficient method to groupby on an array of objects
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Using ES6 Map object:
/**
* @description
* Takes an Array<V>, and a grouping function,
* and returns a Map of the array grouped by the grouping function.
*
* @param list An array of type V.
* @param keyGetter A Function that takes the the Arra...
How to convert JSON to XML or XML to JSON?
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The description of the problem in this commentary applies well to ALL implementations of algorithms which convert JSON to XML or the reverse. Once one accepts that it is not possible simultaneously achieve perfect bi-directional...
How to convert timestamp to datetime in MySQL?
...from_unixtime(1300464000,"%Y-%m-%d %h %i %s") from table;
For in details description about
from_unixtime()
unix_timestamp()
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Application Skeleton to support multiple screens
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Android defines four generalised screen densities:
Qualifier Description Nominal value
ldpi low density 120 ppi
mdpi medium density 160 ppi
hdpi high density 240 ppi
xhdpi extra high density 320 pp...
SecurityException: Permission denied (missing INTERNET permission?)
... does not need to explicitly grant these permission.
See behavior changes description page for details and make sure your app will behave correctly on newer systems too. It's is especially important when your project set targetSdk to at least 23 as then you must support new permissions model (deta...
How does Activity.finish() work in Android?
Could someone provide a description of what happens when an Activity calls its finish() method?
4 Answers
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Android TextView with Clickable Links: how to capture clicks?
...findViewById(R.id.library_rss_expan_chaild_des_textView);
String dec=d.get_description()+"<a href='"+d.get_link()+"'><u>more</u></a>";
CharSequence sequence = Html.fromHtml(dec);
SpannableStringBuilder strBuilder = new SpannableStringBuilder(sequence);
UnderlineSpan[] underli...
How to open a web server port on EC2 instance
... to connect , and then click Next.
In the Name dialog box, type a name and description for this rule, and then click Finish.
Ref:- Microsoft Docs for port Opening
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@import vs #import - iOS 7
...any of the source code.
From the WWDC slides:
Imports complete semantic description of a framework
Doesn't need to parse the headers
Better way to import a framework’s interface
Loads binary representation
More flexible than precompiled headers
Immune to effects of local macro definitions (e.g....
Remove scroll bar track from ScrollView in Android
...iew: Hi, please don't answer just with source code. Try to provide a nice description about how your solution works. See: How do I write a good answer?. Thanks
– sɐunıɔןɐqɐp
Oct 25 '18 at 6:50
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