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How to read data when some numbers contain commas as thousand separator?
... some of the numerical values are expressed as strings with commas as thousand separator, e.g. "1,513" instead of 1513 . What is the simplest way to read the data into R?
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Builder Pattern in Effective Java
...k. If it is non-static, it would require an instance of its owning class - and the point is not to have an instance of it, and even to forbid making instances without the builder.
public class NutritionFacts {
public static class Builder {
}
}
Reference: Nested classes
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How to implement WiX installer upgrade?
...omatic upgrades. It prevents downgrades, giving a localised error message, and also prevents upgrading an already existing identical version (i.e. only lower versions are upgraded):
<MajorUpgrade
AllowDowngrades="no" DowngradeErrorMessage="!(loc.NewerVersionInstalled)"
AllowSameVersionUp...
In Scala how do I remove duplicates from a list?
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What if you have a list of files and need to compare on something like part of the file name?
– ozone
Dec 14 '12 at 0:32
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how to remove shared preference while application uninstall in android
I have an android application to save the login details such as user name and password via SharedPreferences thats works fine, but i need to remove all my used SharedPreferences while my application uninstall. How to do it?
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How do I check if a file exists in Java?
The only similar question on SO deals with writing the file and was thus answered using FileWriter which is obviously not applicable here.
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Why is semicolon allowed in this python snippet?
...needs this semi-colon thing, but somebody thought it would be nice to have and added it to the language.
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What is the difference between an interface and abstract class?
What exactly is the difference between an interface and abstract class?
37 Answers
37
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What is the C# equivalent of NaN or IsNumeric?
...s a number
} else {
// it is not a number
}
Incidentally, all of the standard data types, with the glaring exception of GUIDs, support TryParse.
update
secretwep brought up that the value "2345," will pass the above test as a number. However, if you need to ensure that all of the characters wi...
Pushing read-only GUI properties back into ViewModel
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Yes, I've done this in the past with the ActualWidth and ActualHeight properties, both of which are read-only. I created an attached behavior that has ObservedWidth and ObservedHeight attached properties. It also has an Observe property that is used to do the initial hook-up. U...