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How to check if object has any properties in JavaScript?
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edited Dec 4 '18 at 3:39
Reese Jones
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answered Apr 20 '10 at 6:49
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Order data frame rows according to vector with specific order
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236
Try match:
df <- data.frame(name=letters[1:4], value=c(rep(TRUE, 2), rep(FALSE, 2)))
target...
Postgres: Distinct but only for one column
... (having more than 1 mio. rows), but I have also many duplicates. I select 3 fields: id , name , metadata .
3 Answers
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How to list the contents of a package using YUM?
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438
There is a package called yum-utils that builds on YUM and contains a tool called repoquery tha...
Is there any way to ignore INSTALL_FAILED_VERSION_DOWNGRADE on application install with the Android
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answered Dec 7 '12 at 23:25
supereeesupereee
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How does type Dynamic work and how to use it?
...> val d = new DynImpl
d: DynImpl = DynImpl@6040af64
scala> d.foo
res37: String = foo
scala> d.bar
res38: String = bar
scala> d.selectDynamic("foo")
res54: String = foo
As one can see, it is also possible to call the dynamic methods explicitly.
updateDynamic
Because updateDynamic i...
Why is git prompting me for a post-pull merge commit message?
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3 Answers
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Using querySelector with IDs that are numbers
...Unicode code point. For example, the code point for the character 1 is U+0031, so you would escape it as \000031 or \31 .
Basically, to escape any numeric character, just prefix it with \3 and append a space character ( ). Yay Unicode!
So your code would end up as (CSS first, JS second):
#\3...
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd1 in position 2: ordinal not in range(128)
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153
Unicode is not equal to UTF-8. The latter is just an encoding for the former.
You are doing it ...
(Deep) copying an array using jQuery [duplicate]
...pying, it is not suitable for multidimensional arrays:
var a =[[1], [2], [3]];
var b = a.slice();
b.shift().shift();
// a is now [[], [2], [3]]
Note that although I've used shift().shift() above, the point is just that b[0][0] contains a pointer to a[0][0] rather than a value.
Likewise delete...