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In a javascript array, how do I get the last 5 elements, excluding the first element?
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You can call:
arr.slice(Math.max(arr.length - 5, 1))
If you don't want to exclude the first element, use
arr.slice(Math.max(arr.length - 5, 0))
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Replacement for “rename” in dplyr
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dplyr version 0.3 added a new rename() function that works just like plyr::rename().
df <-...
把数据保存成 CSV 文件并分享出去 · App Inventor 2 中文网
...钮_记一笔、按钮_导出、按钮_导入，再拖一个标签 标签1 显示状态。
拖四个非可视组件：微数据库、文件管理器、信息分享器（在「社交应用」里）、计时器。文件管理器和计时器的属性都不用改。
实验一：先把数...
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How to extract the decision rules from scikit-learn decision-tree?
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How can I change Mac OS's default Java VM returned from /usr/libexec/java_home
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Remove the last character in a string in T-SQL?
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Operation on every pair of element in a list
... module. It does exactly what you describe.
import itertools
my_list = [1,2,3,4]
for pair in itertools.product(my_list, repeat=2):
foo(*pair)
This is equivalent to:
my_list = [1,2,3,4]
for x in my_list:
for y in my_list:
foo(x, y)
Edit: There are two very similar functions as...
How to iterate over arguments in a Bash script
...hat I'd like to make a shell/bash script of. I can write it in terms of $1 easily:
8 Answers
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