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“for” vs “each” in Ruby
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This is the only difference:
each:
irb> [1,2,3].each { |x| }
=> [1, 2, 3]
irb> x
NameError: undefined local variable or method `x' for main:Object
from (irb):2
from :0
for:
irb> for x in [1,2,3]; end
=> [1, 2, 3]
irb> x
=> 3
With t...
Programmatically change input type of the EditText from PASSWORD to NORMAL & vice versa
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22 Answers
22
Active
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Install dependencies globally and locally using package.json
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218
New Note: You probably don't want or need to do this. What you probably want to do is just pu...
how does array[100] = {0} set the entire array to 0?
... not magic.
The behavior of this code in C is described in section 6.7.8.21 of the C specification (online draft of C spec): for the elements that don't have a specified value, the compiler initializes pointers to NULL and arithmetic types to zero (and recursively applies this to aggregates).
Th...
When should I choose Vector in Scala?
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281
As a general rule, default to using Vector. It’s faster than List for almost everything and...
Why does SIGPIPE exist?
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112
I don't buy the previously-accepted answer. SIGPIPE is generated exactly when the write fails wi...
How do I fetch lines before/after the grep result in bash?
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275
You can use the -B and -A to print lines before and after the match.
grep -i -B 10 'error' da...
EF LINQ include multiple and nested entities
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236
Have you tried just adding another Include:
Course course = db.Courses
.Inclu...
A semantics for Bash scripts?
...lear that the execution model of a shell is pretty much:
1. Expand words.
2. Assume the first word is a command.
3. Execute that command with the following words as arguments.
Expansion, command resolution, execution. All of the shell's semantics are bound up in one of these three things, althoug...
Forward host port to docker container
...DCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 22:23:6b:28:6b:e0 brd ff:ff:ff:ff:ff:ff
inet 172.17.42.1/16 scope global docker0
inet6 fe80::a402:65ff:fe86:bba6/64 scope link
valid_lft forever preferred_lft forever
You will need to tell rabbit/mongo to bind to that IP...