CODEWITHSUNDEEP
groovy
carlTEJ
carlTEJ

Reputation: 45

Groovy as keyword

The following code returns an exception:

String x = "12"
double y = x

However this one doesn't:

String x = "12"
double y = x as double

In my application, I have a string x, and I would like to try automatically to cast it with the 'as' keyword to the class of the variable I am affecting it to, though I don't know the class of y in advance. Is that possible without some witchcraft, such as using as y.class or something?

String x = "12"
y = x

The above code returns an error if y happens not to be a string (such as a double), though I'd like it to try to cast x to the type of y before failing.

Upvotes: 1

Views: 2070

Answers (2)

Emmanuel Rosa
Emmanuel Rosa

Reputation: 9885

The expression x as double is the same as the method call x.asType(Double). So you can use this simple pagan spell:

String x = "12"
double y

y = x.asType(y.class)

Upvotes: 4

Will
Will

Reputation: 14529

You can test it before casting:

groovy:000> s="x12"
===> x12
groovy:000> s.isNumber() ? s.toDouble() : null
===> null
groovy:000> s = "12"
===> 12
groovy:000> s.isNumber() ? s.toDouble() : null
===> 12.0

Upvotes: 0

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