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What's the difference between a proc and a lambda in Ruby?
...t;Proc:0x3c7d28@(irb):1>
p.call 1, 2 # => 5
p.call 1 # => NoMethodError: undefined method `**' for nil:NilClass
p.call 1, 2, 3 # => 5
l = lambda {|a, b| puts a**2+b**2 } # => #<Proc:0x15016c@(irb):5 (lambda)>
l.call 1, 2 # => 5
l.call 1 # => ArgumentError: wrong number of ...
How can you list the matches of Vim's search?
...dline
" how-to search for a string recursively
" :grep! "\<doLogErrorMsg\>" . -r
"
" how-to search recursively , omit log and git files
" :vimgrep /srch/ `find . -type f \| grep -v .git \| grep -v .log`
" :vimgrep /srch/ `find . -type f -name '*.pm' -o -name '*.pl'`
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How to know what the 'errno' means?
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You can use strerror() to get a human-readable string for the error number. This is the same string printed by perror() but it's useful if you're formatting the error message for something other than standard error output.
For example:
#i...
Deep Learning（深度学习）学习笔记整理系列之（三） - 大数据 & AI - 清泛...
...多层）、输出层组成的多层网络，只有相邻层节点之间有连接，同一层以及跨层节点之间相互无连接，每一层可以看作是一个logistic regression模型；这种分层结构，是比较接近人类大脑的结构的。
而为了克服神经网络训...
JavaScript isset() equivalent
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the problem with this is that you get an error when you try to check deeper properties, for example: obj.thisdoesntexist.foo !== undefined. In PHP you can use isset or empty and safely at any deep.
– Enrique
Aug 21 '11 at 16:35...
rmagick gem install “Can't find Magick-config”
I get the error shown below when attempting to install the rmagick gem. I am on Snowleopard 10.6 using RVM, Ruby 1.9.2-head and Rails 3.05. Responses to similar questions recommended installing ImageMagick, which I successfully did. Other suggested installing the "libmagick9-dev library", however, I...
How to get the contents of a webpage in a shell variable?
...on is not accepting convert_links = on with -O- option. It is failing with error -k can be used together with -O only if outputting to a regular file.. Is it expected?
– Prasad Bonthu
Jul 17 '18 at 14:40
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While loop to test if a file exists in bash
...some time.
PS This also causes an annoying number of "Stale file handler" errors.
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Convert JSON String To C# Object
...lution. After all, setTest(String test) is not returning, which is compile error as well.
– Payam
Aug 18 '14 at 3:05
1
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Grunt watch error - Waiting…Fatal error: watch ENOSPC
Why do I get the Waiting...Fatal error: watch ENOSPC when I run the watch task ?
How do I solve this issue?
7 Answers
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