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Simplest way to check if key exists in object using CoffeeScript
... referring to keys, and in when referring to array values: val in arr will test whether val is in arr.)
thejh's answer is correct if you want to ignore the object's prototype. Jimmy's answer is correct if you want to ignore keys with a null or undefined value.
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What is the difference between assert, expect and should in Chai?
...dentical for all three interfaces, does not tell you what exactly you were testing, only that the value you got was 1 but you wanted true. If you want to know what you were testing, you need to add a message.
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What is q=0.5 in Accept* HTTP headers?
... answered Nov 30 '17 at 12:22
test30test30
2,7482525 silver badges2323 bronze badges
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I want to exception handle 'list index out of range.'
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You have two options; either handle the exception or test the length:
if len(dlist) > 1:
newlist.append(dlist[1])
continue
or
try:
newlist.append(dlist[1])
except IndexError:
pass
continue
Use the first if there often is no second item, the second if th...
How to check a string for specific characters?
...nformation on strings, including about using the in operator for substring tests.
Update: This does the same job as my above suggestion with less repetition:
# When looking for single characters, this checks for any of the characters...
# ...since strings are collections of characters
any(i in '&l...
I want to get the type of a variable at runtime
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@Readren The value isn't tested for, the class is. Int is Any, but Any is not Int. It works on Scala 2.10, and it should work on Scala 2.11, and I don't know why it isn't.
– Daniel C. Sobral
Jul 18 '16 at 23:39
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Rails bundle install production only
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Take a look at --without option:
bundle install --without development test
By default Bundler installs all gems and your application uses the gems that it needs. Bundler itself knows nothing about Rails and the current environment.
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Which is better, number(x) or parseFloat(x)?
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use isNaN() for testing the NaN value, isNaN(NaN) returns true
– jave.web
Feb 6 '14 at 19:52
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Calling shell functions with xargs
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Exporting the function should do it (untested):
export -f echo_var
seq -f "n%04g" 1 100 | xargs -n 1 -P 10 -I {} bash -c 'echo_var "$@"' _ {}
You can use the builtin printf instead of the external seq:
printf "n%04g\n" {1..100} | xargs -n 1 -P 10 -I {} bash -c...
Difference between no-cache and must-revalidate
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With Jeffrey Fox's interpretation about no-cache, i've tested under chrome 52.0.2743.116 m, the result shows that no-cache has the same behavior as must-revalidate, they all will NOT use local cache when server is unreachable, and, they all will use cache while tap browser's Back...