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Check if a key exists inside a json object
...eck if the 'merchant_id' key exists. I tried the below code, but it's not working. Any way to achieve it?
9 Answers
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Call apply-like function on each row of dataframe with multiple arguments from each row
I have a dataframe with multiple columns. For each row in the dataframe, I want to call a function on the row, and the input of the function is using multiple columns from that row. For example, let's say I have this data and this testFunc which accepts two args:
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Interface vs Base class
...waaay too general). Let us assume that you have an abstract class Mammal, for both of them:
public abstract class Mammal
This base class will probably have default methods such as:
Feed
Mate
All of which are behavior that have more or less the same implementation between either species. To de...
CSS – why doesn’t percentage height work? [duplicate]
How come a percentage value for height doesn’t work but a percentage value for width does?
6 Answers
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How to specify the default error page in web.xml?
I am using <error-page> element in web.xml to specify the friendly error page when user encounters a certain error such as error with code of 404:
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String.Empty versus “” [duplicate]
...ring. To test whether the value of a string is String.Empty, use the IsNullOrEmpty method.
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How can I convert my Java program to an .exe file? [closed]
If I have a Java source file (*.java) or a class file (*.class), how can I convert it to a .exe file?
14 Answers
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Location of parenthesis for auto-executing anonymous JavaScript functions?
...e the result of the expression is the same.
> function(){}()
SyntaxError: Unexpected token (
> (function(){})()
undefined
> (function(){return 'foo'})()
"foo"
> (function(){ return 'foo'}())
"foo"
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How are msys, msys2, and msysgit related to each other?
I've been searching around, but I can't find a thorough description of what's going on with these 3 versions of MSYS. (It's entirely possible I just don't know what to look for.) I do understand that MSYS is a minimal port of Linux tools to support development using MinGW, but I'm not clear on the r...
How to use support FileProvider for sharing content to other apps?
I'm looking for a way to correctly share (not OPEN) an internal file with external application using Android Support library's FileProvider .
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