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How to call shell commands from Ruby
... inside of a Ruby program? How do I then get output from these commands back into Ruby?
20 Answers
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Ways to implement data versioning in MongoDB
... your thoughts how would you implement data versioning in MongoDB. (I've asked similar question regarding Cassandra . If you have any thoughts which db is better for that please share)
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how to POST/Submit an Input Checkbox that is disabled?
I have a checkbox that, given certain conditions, needs to be disabled. Turns out HTTP doesn't post disabled inputs.
18 Ans...
Meaning of epsilon argument of assertEquals for double values
...ed and actual for which both numbers are still considered equal." So I think that should be a <= not <.
– Andrew Cheong
Apr 16 '18 at 17:00
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Remove an entire column from a data.frame in R
Does anyone know how to remove an entire column from a data.frame in R? For example if I am given this data.frame:
6 Answer...
Select datatype of the field in postgres
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Wayne ConradWayne Conrad
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IIS7 deployment - duplicate 'system.web.extensions/scripting/scriptResourceHandler' section
...ploy a .net 3.5 website on the default app pool in IIS7 having the framework section set to 4.0, I get the following error.
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What is the facade design pattern?
...rmal classes. What is important is how they are structured and how they work together to solve a given problem in the best possible way.
The Facade design pattern simplifies the interface to a complex system; because it is usually composed of all the classes which make up the subsystems of the com...
Checking if an object is a given type in Swift
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If you want to check against a specific type you can do the following:
if let stringArray = obj as? [String] {
// obj is a string array. Do something with stringArray
}
else {
// obj is not a string array
}
You can use "as!" and that...
Java: Get first item from a collection
...trs , how can I get the first item out? I could just call an Iterator , take its first next() , then throw the Iterator away. Is there a less wasteful way to do it?
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