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What's the difference between a proc and a lambda in Ruby?
...cept the resulting Proc objects check the number of parameters passed when called.
An example:
p = Proc.new {|a, b| puts a**2+b**2 } # => #<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 = lam...
How to pass object with NSNotificationCenter
... when you do the addObserver(). The receiveTestNotification should only be called when observing a specific notification.
– Johan Karlsson
Feb 17 '16 at 15:06
1
...
Unique Key constraints for multiple columns in Entity Framework
...
Unique indexes in EntityFramework Core:
First approach:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Entity>()
.HasIndex(p => new {p.FirstColumn , p.SecondColumn}).IsUnique();
}
The second approach to create Unique Constraints with EF ...
What is the meaning of “… …” token? i.e. double ellipsis operator on parameter pack
...ipsis.
The comma is purely optional; §8.3.5/4 does say
Where syntactically correct and where “...” is not part of an abstract-declarator, “, ...” is synonymous with “...”.
This is within an abstract-declarator, [edit] but Johannes makes a good point that they are referring to an ...
How to run only one task in ansible playbook?
...s
service: name=hadoop-0.20-mapreduce-jobtracker state=started
and now call use notify in hadoop_master.yml:
- name: Install the namenode and jobtracker packages
apt: name={{item}} force=yes state=latest
with_items:
- hadoop-0.20-mapreduce-jobtracker
- hadoop-hdfs-namenode
- hadoo...
ORA-30926: unable to get a stable set of rows in the source tables
...clause. This probably means that TABLE_A is a parent table and the same ROWID is returned several times.
You could quickly solve the problem by using a DISTINCT in your query (in fact, if 'Y' is a constant value you don't even need to put it in the query).
Assuming your query is correct (don't kno...
How can I prevent the textarea from stretching beyond his parent DIV element? (google-chrome issue o
... {
resize: horizontal;
}
Or you can limit size:
textarea {
max-width: 100px;
max-height: 100px;
}
To limit size to parents width and/or height:
textarea {
max-width: 100%;
max-height: 100%;
}
sha...
In-memory size of a Python structure
...tiple of 8" which I believe is correct for the way malloc behaves here. No idea why decimal gets so distorted (with pympler on 2.6, too).
– Alex Martelli
Aug 26 '09 at 2:40
2
...
Sending emails in Node.js? [closed]
...e Buffers as nodemailer requires. Means that you can link it to, f.e., formidable to pass the attachments from an html form to the mailer. It also supports queueing..
All in all, no idea why nodejitsu ppl chose nodemailer to base their version on, emailjs is just much more advanced.
...
jQuery Scroll To bottom of the page
... $(document).height()-$(window).height() });
To scroll to a particular ID, use its .scrollTop(), like this:
$("html, body").animate({ scrollTop: $("#myID").scrollTop() }, 1000);
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