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When to use symbols instead of strings in Ruby?
...as identifiers in your code. You should be worrying about what symbols are meant to be, not only when you should use symbols. Symbols are meant to be identifiers. If you follow this philosophy, chances are that you will do things right.
There are several differences between the implementation of s...
Understanding the Rails Authenticity Token
... get the same result every time)." Just a subtle clarification here. Safe means no side-effects. Idempotent means the same side effect no matter how many time a service is called. All safe services are inherently idempotent because there are no side effects. Calling GET on a current-time resource ...
How to design a product table for many kinds of product where each product has many parameters
...uct types, with enough columns to store all attributes of all types. This means a lot of columns, most of which are NULL on any given row.
Class Table Inheritance: one table for Products, storing attributes common to all product types. Then one table per product type, storing attributes specific t...
How can I make git do the “did you mean” suggestion?
...repo$ git puhs
git: 'puhs' is not a git command. See 'git --help'
Did you mean this?
push
kristian@office:~/myrepo$ idid !!
Counting objects: 18, done.
Delta compression using up to 32 threads.
Compressing objects: 100% (10/10), done.
Writing objects: 100% (10/10), 1.17 KiB, done.
Total 10 (...
How to make an anchor tag refer to nothing?
...
breaks when linking images in IE What does this mean?
– eugene
Aug 30 '13 at 3:44
15
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AngularJS $resource RESTful example
...
$resource was meant to retrieve data from an endpoint, manipulate it and send it back. You've got some of that in there, but you're not really leveraging it for what it was made to do.
It's fine to have custom methods on your resource, bu...
What does an underscore in front of an import statement mean?
...ers described it completely, for "Show me The Code" people, this basically means: create package-level variables and execute the init function of that package.
And (if any) the hierarchy of package-level variables & init functions of packages that, this package has imported.
The only side effe...
What does the forward slash mean in the CSS font shorthand?
...2f%2fstackoverflow.com%2fquestions%2f4080265%2fwhat-does-the-forward-slash-mean-in-the-css-font-shorthand%23new-answer', 'question_page');
}
);
Post as a guest
...
How to use the 'sweep' function
... looking at the code in R 3.0.1. Here sweep is used to subtract out column means before computing the covariance. On line 19 of the code the centering vector is derived:
center <- if (center)
colSums(wt * x)
else 0
and on line 54 it is swept out of the matrix
x <- sqrt(wt) * ...
How can I change an element's text without changing its child elements?
...
anyone curious about nodeType=3 it is mean filter only node type of "TEXT", w3schools.com/jsref/prop_node_nodetype.asp for more info
– ktutnik
Jan 9 '15 at 4:09
...