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Xcode 4, Core Data Model Version - Set Current Version
I'm confused about how to perform the following function in Xcode 4 to set the model to use after creating a versioned model.
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pandas three-way joining multiple dataframes on columns
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497
Assumed imports:
import pandas as pd
John Galt's answer is basically a reduce operation. I...
Is there a performance difference between a for loop and a for-each loop?
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From Item 46 in Effective Java by Joshua Bloch :
The for-each loop, introduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
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How to check if an element is in an array
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Swift 2, 3, 4, 5:
let elements = [1, 2, 3, 4, 5]
if elements.contains(5) {
print("yes")
}
contains() is a protocol extension method of SequenceType (for sequences of Equatable elements) and not a global method as in
earlier releas...
Why does the PHP json_encode function convert UTF-8 strings to hexadecimal entities?
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Since PHP/5.4.0, there is an option called JSON_UNESCAPED_UNICODE. Check it out:
https://php.net/function.json-encode
Therefore you should try:
json_encode( $text, JSON_UNESCAPED_UNICODE );
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Showing a different background colour in Vim past 80 characters
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224
If you have Vim >= v7.3, you can simply add this to your .vimrc to highlight 81 and onward (s...
Accessing members of items in a JSONArray with Java
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idewz
544 bronze badges
answered Oct 14 '09 at 20:32
notnoopnotnoop
55.8k2020 gold ba...
Generate a Hash from string in Javascript
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edited Mar 13 at 13:14
FZs
9,8351111 gold badges2727 silver badges4040 bronze badges
answered Sep 3...
Overloading Macro on Number of Arguments
...FOO3(foo,bar,baz)
If you want a fourth one:
#define GET_MACRO(_1,_2,_3,_4,NAME,...) NAME
#define FOO(...) GET_MACRO(__VA_ARGS__, FOO4, FOO3, FOO2)(__VA_ARGS__)
FOO(a,b,c,d) # expeands to FOO4(a,b,c,d)
Naturally, if you define FOO2, FOO3 and FOO4, the output will be replaced by those o...
How to return an empty ActiveRecord relation?
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489
There is a now a "correct" mechanism in Rails 4:
>> Model.none
=> #<ActiveRecord...