Things I learned today about C#

[andrewducker]

The code I've been writing to convert a list into a comma-delimited string that consists of:
var duckerBrothers = new List<string> { "Andy", "Mike", "Hugh" };
var output = string.Empty;
foreach (var duckerBrother in duckerBrothers)
{
if (output != string.Empty)
{
output += ", ";
}

output += duckerBrother;
}

Can be rewritten as:
var duckerBrothers = new List<string> { "Andy", "Mike", "Hugh" };
var output = string.Join(",", duckerBrothers);

That's what I get for assuming that there is no built-in way of doing things.

Comments

[simont]

I had that problem in Python once, and found it needed fewer special-case handlers than I'd expected:

    answer = ", ".join(words[:-2] + [" and ".join(words[-2:])])

Though that does rely on Python's array slice expressions having the right edge-case behaviour when the array gets shorter than 2 elements, and I don't know if C# will do the same.

[andrewducker]

Having checked, I can grab the last entry of a list easily, but grabbing the last two isn't built in, so I'd have to write my own code for it.

It's not quite as neat as Python, certainly!