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Closed 11 years ago.
Possible Duplicate:
What does map(&:name) mean in Ruby?
Assume that Game is an active record model, what does the & mean in the following code?
Games.group_by(&:genre)
See this: What do you call the &: operator in Ruby?
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Is there any way I can define a variable in LaTeX?
(5 answers)
Closed 5 years ago.
Is there a way to add a text by reference using LaTeX? I have several text references to 'versionXX.yy'. I wonder if I can define this in one place so I don't need to update it in all places.
Thanks
You could define a variable or new command with your version at the beginning and then just use this definition. See here
Btw. there is a special site called tex.stackexchange.com for this kind of questions.
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Add an element to an array in Swift
(15 answers)
Closed 5 years ago.
everybody! I've just started learning swift so sorry if the question is dumb. I want to add values to an array "uu" using a loop. However every time it just overwrites "uu".
Pls help, thanks!
My code
That is simple as
uu.append(newNumber)
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What is the difference between '->' (arrow operator) and '.' (dot operator) in Objective-C?
(3 answers)
Closed 8 years ago.
I am familiar in iOS/Objective C. Now I see people using self->property in some cases. How does it differ from self.property? What is the actual need? I googled, no answer. Curious in it.
self->property is the same as _property, meaning it accesses the ivar directly.
self.property on the other hand calls the setter/getter.
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What is the standard (or best supported) big number (arbitrary precision) library for Lua?
(6 answers)
Closed 8 years ago.
As an example, I want to convert:
1j16qd5g0lc
To:
5589146303201280
But currently ‘tonumber’ converts it to:
5.5891463032013e+15
I understand that there is a bit.tonumber function that might work better but that function is not available to me. Could someone implement what I need easily? I am not too familiar Lua.
Thank you! :)
Try print(string.format("%.0f",tonumber("1j16qd5g0lc",36))).
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Rails lists have .first and .second – is there a .hundredth or .sixty_nineth ?
(3 answers)
Closed 9 years ago.
You can see the method here.
Is this a joke?
I think Array#forty_two is a quite clever and convenient way to fetch a really important element from an array. An element that might answer a lot of questions.