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execJs: 'Could not find a JavaScript runtime' but execjs AND therubyracer are in Gemfile
...u its: sudo apt-get install nodejs
I'm using 64bit ubuntu 11.10
update:
From @Galina 's answer below I'm guessing that the latest version of nodejs is required,
so @steve98177 your best option on a redhat(or CentOS) box is to install from source code as @Galina did, but as you can't "make/install...
How do you sign a Certificate Signing Request with your Certification Authority?
...he email in the DN
copy_extensions = copy # Required to copy SANs from CSR to cert
####################################################################
[ req ]
default_bits = 4096
default_keyfile = cakey.pem
distinguished_name = ca_distinguished_name
x509_extensions = ca_extens...
Python: Continuing to next iteration in outer loop
...e), you can do one of the following
Refactor the loops you want to escape from into a function
def inner():
for j in ...:
for k in ...:
if something:
return
for i in ...:
inner()
The disadvantage is that you may need to pass to that new function some...
What does 'require: false' in Gemfile mean?
...:require => false these particular gems and explicitly require "thegem" from the rake task. This would then save memory in the main app processes and startup time etc. App performance, however, should not be affected even if you require these additional gems in every process.
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Why is React's concept of Virtual DOM said to be more performant than dirty model checking?
...ut React's diff algorithm here: http://calendar.perfplanet.com/2013/diff/. From what I understand, what makes React fast is:
Batched DOM read/write operations.
Efficient update of sub-tree only.
Compared to dirty-check, the key differences IMO are:
Model dirty-checking: React component is expl...
Python: using a recursive algorithm as a generator
... In Python 3.4, you can replace the last two lines with yield from getPermutations(string[:i] + string[i+1:]), which is more efficient in many ways!
– Manuel Ebert
Apr 29 '14 at 17:46
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What is an existential type?
...ytecode type is, but it doesn't need to; all it does is relay the bytecode from VirtualMachine.compile to VirtualMachine.run.
Java type wildcards (ex: List<?>) are a very limited form of existential types.
Update: Forgot to mention that you can sort of simulate existential types with univers...
What's the opposite of head? I want all but the first N lines of a file
...first 2 lines, -n +3 should give you the output you are looking for (start from 3rd).
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How can I determine the direction of a jQuery scroll event?
... event.preventDefault() at the bottom of your callback to prevent the page from scrolling, and so that you can use the mousewheel event for something other than a page scroll, like some type of zoom functionality.
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Linux command to print directory structure in the form of a tree
Is there any linux command that I can call from a Bash script that will print the directory structure in the form of a tree, e.g.,
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