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Calculating the difference between two Java date instances
...it.
TimeUnit is java.util.concurrent.TimeUnit, a standard Java enum going from nanos to days.
Human readable diff (without lib)
public static Map<TimeUnit,Long> computeDiff(Date date1, Date date2) {
long diffInMillies = date2.getTime() - date1.getTime();
//create the list
Li...
What is a regular expression for a MAC Address?
... As an aside, the quote above concerning "standard format" comes from Wikipedia, not the 802.3 standards body. IEEE 802-2014 actually specifies hyphens for ordinary MAC addresses (§ 8.1 ¶ 3) and colons for the obsolescent bit-reversed notation (¶ 4). Importantly, in practice, no one o...
Avoid passing null as the view root (need to resolve layout parameters on the inflated layout's root
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@Coeffect but what should I use when inflating from within the Activity? What should I use instead of parent?
– Alexander Kuznetsov
Oct 16 '14 at 18:40
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Overriding superclass property with different type in Swift
...ow to override a property on a superclass's with another object subclassed from the original property?
14 Answers
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Why does Git treat this text file as a binary file?
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We are both right, but from different perspectives. We both say "Git inspects the contents to determine its type." We both say that to make git know it should be treated as UTF16 the user needs to tell git via .gitattributes etc.
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Underscore: sortBy() based on multiple attributes
...de below I create a new array of patients sorted by Name within RoomNumber from the original array called patients.
var sortedPatients = _.chain(patients)
.sortBy('Name')
.sortBy('RoomNumber')
.value();
share
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How to check if a file exists in the Documents directory in Swift?
... presumably those comments were that absoluteString doesn't work from a URL, but path does, which is what I found!
– CMash
Sep 27 '19 at 7:36
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Reorder levels of a factor without changing order of values
... for manipulating factors and I'm finding it outrageously useful. Examples from the OP's data frame:
levels(df$letters)
# [1] "a" "b" "c" "d"
To reverse levels:
library(forcats)
fct_rev(df$letters) %>% levels
# [1] "d" "c" "b" "a"
To add more levels:
fct_expand(df$letters, "e") %>% leve...
How to send a command to all panes in tmux?
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this is bash, but can one do the same from the tmux command prompt, I mean by doing prefix + :
– Rho Phi
Apr 25 '16 at 17:15
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Why does the C++ STL not provide any “tree” containers?
... general and involved enough to merit specialized tree classes independent from it. Also, the fact that std::map and std::set require a tree is, IMO, another argument for having an stl::red_black_tree etc. Finally, the std::map and std::set trees are balanced, an std::tree might not be.
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