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The grammar of the language derives from the Java grammar, but enhances it with specific constructs for Groovy, and allows certain simplifications. This is particularly interesting when certain identifiers contain illegal characters that are forbidden by the Java Language Specification, but which are allowed by Groovy when quoted.
For example, characters like a dash, a space, an exclamation mark, etc.
// the base is a Big Decimal and the exponent a negative int // but the result can be represented as an Integer assert 0.5 ** -2 instanceof Integer // 4 // the base is an int, and the exponent a negative float // but again, the result can be represented as an Integer assert 1 ** -0.3f instanceof Integer // 1 // the base is an int, and the exponent a negative int // but the result will be calculated as a Double // (both base and exponent are actually converted to doubles) assert 10 ** -1 instanceof Double // 0.1 // the base is a Big Decimal, and the exponent is an int, so return a Big Decimal assert 1.2 ** 10 instanceof Big Decimal // 6.1917364224 // the base is a float or double, and the exponent is an int // but the result can only be represented as a Double value assert 3.4f ** 5 instanceof Double // 454.35430372146965 assert 5.6d ** 2 instanceof Double // 31.359999999999996 // the exponent is a decimal value // and the result can only be represented as a Double value assert 7.8 ** 1.9 instanceof Double // 49.542708423868476 assert 2 ** 0.1f instanceof Double // 1.0717734636432956def array List = [1, 2, 3] assert array List instanceof
Array List def linked List = [2, 3, 4] as Linked List (1) assert linked List instanceof
An empty slashy string cannot be represented with a double forward slash, as it’s understood by the Groovy parser as a line comment.The result of the power operation depends on its operands, and the result of the operation (in particular if the result can be represented as an integral value).// base and exponent are ints and the result can be represented by an Integer assert 2 ** 3 instanceof Integer // 8 assert 10 ** 9 instanceof Integer // 1_000_000_000 // the base is a long, so fit the result in a Long // (although it could have fit in an Integer) assert 5L ** 2 instanceof Long // 25 // the result can't be represented as an Integer or Long, so return a Big Integer assert 100 ** 10 instanceof Big Integer // 10e20 assert 1234 ** 123 instanceof Big Integer // 170515806212727042875...MAX_VALUE 1 def c = 2147483648 assert c instanceof Long // Long.MAX_VALUE def d = 9223372036854775807 assert d instanceof Long // Long.
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(arr Str instanceof List) def num Arr = [1, 2, 3] as int (3) assert num Arr instanceof int (4) assert num Arr.size() == 3 Sometimes called dictionaries or associative arrays in other languages, Groovy features maps.