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if (key in object) or if(object.hasOwnProperty(key)
Do the following two statements produce the same output? Is there any reason to prefer one way to the other?
7 Answers
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CFLAGS vs CPPFLAGS
I understand that CFLAGS (or CXXFLAGS for C++) are for the compiler, whereas CPPFLAGS is used by the preprocessor.
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If strings are immutable in .NET, then why does Substring take O(n) time?
Given that strings are immutable in .NET, I'm wondering why they have been designed such that string.Substring() takes O( substring.Length ) time, instead of O(1) ?
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Read only file system on Android
I recently rooted my Droid X and everything seems to be working perfectly. I made some changes to build.prop and when I do adb push build.prop /system/ I get the following error: failed to copy 'c:\build.prop' to '/system//build.prop': Read-only file system .
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Reverse of JSON.stringify?
I'm stringyfing an object like {'foo': 'bar'}
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Why is std::map implemented as a red-black tree?
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What's the difference between console.dir and console.log?
In Chrome the console object defines two methods that seem to do the same thing:
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Should I use 'has_key()' or 'in' on Python dicts?
I wonder what is better to do:
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Javascript reduce() on Object
There is nice Array method reduce() to get one value from the Array. Example:
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How to flatten tree via LINQ?
So I have simple tree:
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