Neatest way of getting the digits out of a string

todigits.coffee

# It's very common to have a class with a name like "button-23" or
# "container2346112" and to need to extricate just the digits. Of course
# this is simple, but I've seen some developers do this in weird and
# wonderful ways.  Here's a simple way:

String::toDigits = -> parseInt @.replace(/\D+/g, ""), 10

# Or in JavaScript:
`String.prototype.toDigits = function() { return parseInt(this.replace(/\D+/, ""), 10); }`

# Thus:
# "abc123def456".toDigits() => 123456