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Is it better to return null or empty collection?
...-workers and users of your classes.
When talking about properties, always set your property once and forget it
public List<Foo> Foos {public get; private set;}
public Bar() { Foos = new List<Foo>(); }
In .NET 4.6.1, you can condense this quite a lot:
public List<Foo> Foos { g...
Convert JS object to JSON string
...ing
if it finds any malicious code in
it.For even more security: Don't set
the includeFunctions flag to true.
Douglas Crockford, father of the JSON concept, wrote one of the first stringifiers for JavaScript. Later Steve Yen at Trim Path wrote a nice improved version which I have used for...
Getting a slice of keys from a map
...
It's slightly better to set the actual size instead of capacity and avoid append altogether. See my answer for details.
– Vinay Pai
Jan 8 '15 at 19:37
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How to execute a raw update sql with dynamic binding in rails
...:
st = ActiveRecord::Base.connection.raw_connection.prepare("update table set f1=? where f2=? and f3=?")
st.execute(f1, f2, f3)
st.close
I'm not sure if there are other ramifications to doing this (connections left open, etc). I would trace the Rails code for a normal update to see what it's doin...
How to set a JavaScript breakpoint from code in Chrome?
... A nice trick is to trigger the debugger after a few seconds: setTimeout(function(){debugger;}, 3000);
– Shahar
Jul 8 '14 at 13:02
30
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Android ListView headers
...flater, convertView);
break;
}
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
return convertView;
}
public static class ViewHolder {
public View View; }
}
Then we have classes the implement Ite...
Git: Merge a Remote branch locally
...etch.
Note 2: These commands also work with other remote repos so you can setup an origin and an upstream if you are working on a fork.
Opposite scenario: If you want to merge one of your local branch on a remote branch (as opposed to a remote branch to a local one, as shown above), you need to ...
Javascript: How to detect if browser window is scrolled to bottom?
...ev) {
if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight) {
// you're at the bottom of the page
}
};
See demo
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chart.js load totally new data
The API for chart.js allows one to edit points of the datasets loaded into it, for example:
19 Answers
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How to make an app's background image repeat
I have set a background image in my app, but the background image is small and I want it to be repeated and fill in the whole screen. What should I do?
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