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jQuery map vs. each
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270
The each method is meant to be an immutable iterator, where as the map method can be used as a...
How to add new item to hash
...eate the hash:
hash = {:item1 => 1}
Add a new item to it:
hash[:item2] = 2
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Clojure: cons (seq) vs. conj (list)
...guments to insert into a collection, while cons takes just one:
(conj '(1 2 3) 4 5 6)
; => (6 5 4 1 2 3)
(cons 4 5 6 '(1 2 3))
; => IllegalArgumentException due to wrong arity
Another difference is in the class of the return value:
(class (conj '(1 2 3) 4))
; => clojure.lang.Persistent...
Unicode与UTF-8互转(C语言实现) - C/C++ - 清泛网 - 专注C/C++及内核技术
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位(bit)有0和1两种状态, 因此八个二进制位就可以组合出 256种状态, 这被称为一个字
节(byte). 也就是说, 一个字节一共可以用来表示256种不同的状态, 每一个状态对应一
个符号, 就是256个符号, 从 0000000到11111111.
上个世纪60年代...
How to reorder data.table columns (without copying)
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2 Answers
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Emulate ggplot2 default color palette
What function can I use to emulate ggplot2's default color palette for a desired number of colors. For example, an input of 3 would produce a character vector of HEX colors with these colors:
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How do I concatenate or merge arrays in Swift?
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12 Answers
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How to get Scala List from Java List?
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EDIT: Note that this is deprecated since 2.12.0. Use JavaConverters instead. (comment by @Yaroslav)
Since Scala 2.8 this conversion is now built into the language using:
import scala.collection.JavaConversions._
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lst.toList.foreach{ node => .... }
works. ...
R - Concatenate two dataframes?
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227
You want "rbind".
b$b <- NA
new <- rbind(a, b)
rbind requires the data frames to have...
How would I get a cron job to run every 30 minutes?
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edited Sep 27 '11 at 13:45
Tim Cooper
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