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How to conditionally push an item in an observable array?
...f). This allows you to do:
if (myObservableArray.indexOf(itemToAdd) < 0) {
myObservableArray.push(itemToAdd);
}
If the two are not actually a reference to the same object and you want to run custom comparison logic, then you can use ko.utils.arrayFirst like:
var match = ko.utils.arrayFirst...
jQuery Plugin: Adding Callback functionality
... var options = $.extend({
callback: function() {}
}, arguments[0] || {});
// call the callback and apply the scope:
options.callback.call(this);
};
Use it like this:
$('.elem').myPlugin({
callback: function() {
// some action
}
});
...
Converting string from snake_case to CamelCase in Ruby
...
10 Answers
10
Active
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Immutable vs Mutable types
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What? Floats are immutable? But can't I do
x = 5.0
x += 7.0
print x # 12.0
Doesn't that "mut" x?
Well you agree strings are immutable right? But you can do the same thing.
s = 'foo'
s += 'bar'
print s # foobar
The value of the variable changes, but it changes by chang...
CoffeeScript, When to use fat arrow (=>) over arrow (->) and vice versa
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answered Jan 23 '12 at 0:18
nicolaskruchtennicolaskruchten
20k77 gold badges5858 silver badges8080 bronze badges
...
How do I calculate the normal vector of a line segment?
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answered Aug 7 '09 at 8:49
Oren TrutnerOren Trutner
22k77 gold badges5050 silver badges5555 bronze badges
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In JavaScript, is returning out of a switch statement considered a better practice than using break?
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10
@Mark Costello's answer made me thank a bit more about your question. I think you're looking for a general "best practice" guideline, but i...
How does grep run so fast?
...omparison
# (everything is in the buffer cache)
$ time grep -c 'tg=f_c' 20140910.log
28
0.168u 0.068s 0:00.26
$ time grep -c ' /cc/merchant.json tg=f_c' 20140910.log
28
0.100u 0.056s 0:00.17
The longer form is 35% faster!
How come? Boyer-Moore consructs a skip-forward table from the pattern-st...
Check a collection size with JSTL
...
<c:if test="${companies.size() > 0}">
</c:if>
This syntax works only in EL 2.2 or newer (Servlet 3.0 / JSP 2.2 or newer). If you're facing a XML parsing error because you're using JSPX or Facelets instead of JSP, then use gt instead of >.
<c...
Get city name using geolocation
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204
You would do something like that using Google API.
Please note you must include the google ma...