groovy

I’d just use the arithmetic operators, I think it’s much more obvious what’s going on: def a = [“foo”, “bar”, “baz”, “baz”] def b = [“foo”, “qux”] assert [“bar”, “baz”, “baz”, “qux”] == ((a – b) + (b – a))

Solution: org.codehaus.groovy.runtime.StackTraceUtils.sanitize(new Exception()).printStackTrace() Original answer: A Google search returns the following information: Apparently, there is a method in org.codehaus.groovy.runtime.StackTraceUtils called printSanitizedStackTrace. There isn’t much documentation for the method, though there is a method called sanitize which is described as remove all apparently groovy-internal trace entries from the exception instance This modifies the original instance and … Read more

The trick was to use a list: println([‘ls’, ‘/tmp/folder with spaces’].execute().text)

I haven’t yet found a good approach for excluding the read-only properties (i.e., metaClass, class), but if you want to set the value of all properties in the Foo instance that are also in the Foo2 instance you could do the following. class Foo { def feck = “fe” def arse = “ar” def drink … Read more

These are plain methods but they follow quite a specific pattern – they take a Closure as their last argument. A Closure is a piece of functionality that you can pass around and call when applicable. For example, method eachWithIndex might look like this (roughly): void eachWithIndex(Closure operation) { for (int i = 0; this.hasNext(); … Read more

You should put the \n first. That way your newline will be written before your text: f.append(‘\nhello again!’)