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Replacement for “rename” in dplyr
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148
dplyr version 0.3 added a new rename() function that works just like plyr::rename().
df <- ...
How does PHP 'foreach' actually work?
...on iterate($arr) {
foreach ($arr as $v) {}
}
$outerArr = [0, 1, 2, 3, 4];
iterate($outerArr);
Here, $arr will be duplicated to prevent IAP changes on $arr from leaking to $outerArr. In terms of the conditions above, the array is not a reference (is_ref=0) and is used in two places (refcount=2...
What is the difference between children and childNodes in JavaScript?
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4 Answers
4
Active
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INSERT … ON DUPLICATE KEY (do nothing)
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edited Sep 25 '19 at 4:34
izogfif
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answered J...
_=> what does this underscore mean in Lambda expressions?
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edited May 6 '10 at 4:11
answered May 6 '10 at 4:04
C...
Sass calculate percent minus px
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247
Sass cannot perform arithmetic on values that cannot be converted from one unit to the next. S...
In Ruby on Rails, what's the difference between DateTime, Timestamp, Time and Date?
.... As TIMESTAMP only stores the number of seconds since 1970-01-01, it uses 4 bytes.
You can read more about the differences between time formats in MySQL here.
In the end, it comes down to what you need your date/time column to do. Do you need to store dates and times before 1970 or after 2038? Us...
What is a 'semantic predicate' in ANTLR?
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ANTLR 4
For predicates in ANTLR 4, checkout these stackoverflow Q&A's:
Syntax of semantic predicates in Antlr4
Semantic predicates in ANTLR4?
ANTLR 3
A semantic predicate is a way to enforce extra (semantic) rules upon ...
Array slices in C#
...clude the Linq namespace with using System.Linq;):
byte[] foo = new byte[4096];
var bar = foo.Take(41);
If you really need an array from any IEnumerable<byte> value, you could use the ToArray() method for that. That does not seem to be the case here.
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