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To find whether a column exists in data frame or not
I have a data.frame with the name "abcframe"
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'typeid' versus 'typeof' in C++
I am wondering what the difference is between typeid and typeof in C++. Here's what I know:
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Jackson JSON custom serialization for certain fields
Is there a way using Jackson JSON Processor to do custom field level serialization? For example, I'd like to have the class
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Is it considered bad practice to perform HTTP POST without entity body?
I need to invoke a process which doesn't require any input from the user, just a trigger. I plan to use POST /uri without a body to trigger the process. I want to know if this is considered bad from both HTTP and REST perspectives?
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jQuery: select all elements of a given class, except for a particular Id
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How to use querySelectorAll only for elements that have a specific attribute set?
I'm trying to use document.querySelectorAll for all checkboxes that have the value attribute set.
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chai test array equality doesn't work as expected
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Why does PostgreSQL perform sequential scan on indexed column?
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How do I update zsh to the latest version?
I recently switched to zsh on my Terminal.app on my OS X machine successfully. The version number of zsh is 4.3.11.
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