Groovy Goodness: See if String is a Number

Groovy adds several methods to the String class we can use to determine if the String value can be parsed into a Number or related class like BigDecimal.

def n = '42.01'
def i = '201'

assert n.isNumber() && n.isBigDecimal() && n.isFloat() && n.isDouble()
assert i.isInteger() && i.isLong() && i.isBigInteger()