Okay, I had to add one more. Every Regex object in Scala has an extractor (see answer from oxbox_lakes above) that gives you access to the match groups. So you can do something like: // Regex to split a date in the format Y/M/D. val regex = “(\\d+)/(\\d+)/(\\d+)”.r val regex(year, month, day) = “2010/1/13” The … Read more
You don’t need to define any parameters for a function. You can just use the function’s arguments array-like object. function sum() { var retval = 0; for (var i = 0, len = arguments.length; i < len; ++i) { retval += arguments[i]; } return retval; } sum(1, 2, 3) // returns 6
Most C++ programmers are familiar with the ternary operator: x = (y < 0) ? 10 : 20; However, they don’t realize that it can be used as an lvalue: (a == 0 ? a : b) = 1; which is shorthand for if (a == 0) a = 1; else b = 1; Use … Read more
Chaining comparison operators: >>> x = 5 >>> 1 < x < 10 True >>> 10 < x < 20 False >>> x < 10 < x*10 < 100 True >>> 10 > x <= 9 True >>> 5 == x > 4 True In case you’re thinking it’s doing 1 < x, which comes … Read more
This isn’t C# per se, but I haven’t seen anyone who really uses System.IO.Path.Combine() to the extent that they should. In fact, the whole Path class is really useful, but no one uses it! I’m willing to bet that every production app has the following code, even though it shouldn’t: string path = dir + … Read more