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How to check if a value exists in an array in Ruby
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If you want to check by a block, you could try any? or all?.
%w{ant bear cat}.any? {|word| word.length >= 3} #=> true
%w{ant bear cat}.any? {|word| word.length >= 4} #=> true
[ nil, true, 99 ].any? #=&...
Rails create or update magic?
...y_name("Roger")
user.email = "email@example.com"
user.save
You can use a block, but the block only runs if the record is new.
User.where(name: "Roger").first_or_initialize do |user|
# this won't run if a user with name "Roger" is found
user.save
end
User.find_or_initialize_by(name: "Roger")...
What's the difference between commit() and apply() in SharedPreferences
...say if another commit() happens after you fire apply(), that commit() will block until the apply() is persisted to disk, which makes it clear that this problem does not happen when it comes to 'write' operations, but what about if you are writing and reading immediately after? From my tests, the new...
Are NSLayoutConstraints animatable? [duplicate]
I am trying to animate up some views so that they are blocked by the giant keyboard in landscape. It works well if I simply animate the frames, but others have suggested that this is counter-productive and I should be updating the NSLayoutConstraints instead. However, they don't seem to be animata...
When is the thread pool used?
...e thread. All of the javascript you write executes in this loop, and if a blocking operation happens in that code, then it will block the entire loop and nothing else will happen until it finishes. This is the typically single threaded nature of node that you hear so much about. But, it's not the...
Correct way to pause Python program
...know about the sleep function in the time module but what if I have a long block of text I want the user to read?
– RandomPhobia
Jul 19 '12 at 0:34
7
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Does java.util.List.isEmpty() check if the list itself is null? [duplicate]
...I deleted my stupid comment, before I saw your answer. Maybe he comes from PHP where we have !empty($foo) as somewhat an alias for isset($foo) && $foo != "".
– Aufziehvogel
Jul 16 '12 at 20:39
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Why do people say that Ruby is slow? [closed]
...me:
Ruby 1.9 vs. Python3 within the same order of magnitude
Ruby 1.9 vs. PHP within the same order of magnitude
Ruby 1.9 vs. Java 6 server up to two orders of magnitude slower!
Ruby 1.9 vs. C (gcc) up to two orders of magnitude slower!
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Why is Ruby considered slow?
Depends on whom you as...
Auto increment in phpmyadmin
I have an existing database using PHP, MySQL and phpMyAdmin.
9 Answers
9
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Full examples of using pySerial package [closed]
...n and open the port
#possible timeout values:
# 1. None: wait forever, block call
# 2. 0: non-blocking mode, return immediately
# 3. x, x is bigger than 0, float allowed, timeout block call
ser = serial.Serial()
#ser.port = "/dev/ttyUSB0"
ser.port = "/dev/ttyUSB7"
#ser.port = "/dev/ttyS2"...