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How to extend an existing JavaScript array with another array, without creating a new array
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Update 2018: A better answer is a newer one of mine: a.push(...b). Don't upvote this one anymore, as it never really answered the question, but it was a 2015 hack around first-hit-on-Google :)
For those that simply searched for "JavaScript array extend" and got ...
How do .gitignore exclusion rules actually work?
...llows for the exclusion).
Think of the exclusions as saying "but not this one" rather than "but include this" - "ignore this directory (/a/b/c/) but not this one (foo)" doesn't make much sense; "ignore all files in this directory (/a/b/c/*) but not this one (foo)" does. To quote the man page:
A...
Sometimes adding a WCF Service Reference generates an empty reference.cs
...on being thrown by the import. You may receive this type of message about one of your types: "referenced type cannot be used since it does not match imported DataContract".
This could simply be as specified in that there is a difference in one of the types in the referenced assembly from what was ...
How to add /usr/local/bin in $PATH on Mac
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export PATH=$PATH:/usr/local/git/bin:/usr/local/bin
One note: you don't need quotation marks here because it's on the right hand side of an assignment, but in general, and especially on Macs with their tradition of spacy pathnames, expansions like $PATH should be double-quoted...
Remove duplicated rows using dplyr
...(0:1, 10, replace = T),
y = sample(0:1, 10, replace = T),
z = 1:10
)
One approach would be to group, and then only keep the first row:
df %>% group_by(x, y) %>% filter(row_number(z) == 1)
## Source: local data frame [3 x 3]
## Groups: x, y
##
## x y z
## 1 0 1 1
## 2 1 0 2
## 3 1 1 ...
When should I use jQuery deferred's “then” method and when should I use the “pipe” method?
...hen the deferred object is resolved or rejected. It is the same as using .done() or .fail().
You'd use .pipe() to (pre)filter the result somehow. The return value of a callback to .pipe() will be passed as argument to the done and fail callbacks. It can also return another deferred object and the f...
WatiN or Selenium? [closed]
...t coding some automated tests of our presentation soon. It seems that everyone recommends WatiN and Selenium . Which do you prefer for automated testing of ASP.NET web forms? Which of these products work better for you?
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In Python, how do I indicate I'm overriding a method?
...ainly this happens after (again) seeing the same bug in our code base: Someone has forgotten some "interface" implementing class while renaming a method in the "interface"..
Well Python ain't Java but Python has power -- and explicit is better than implicit -- and there are real concrete cases in t...
How do I prevent commands from showing up in Bash history?
...xport HISTIGNORE=' *'. Then just begin any command you want to ignore with one space.
$ ls # goes in history
$ ls # does not
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Convert Newtonsoft.Json.Linq.JArray to a list of specific object type
...le if the array has a null field? This time i get the error JsonSerializationException. I want the data and i want it remain null for any null data.
– Ensar Turkoglu
Apr 19 '17 at 11:09
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