Groovy Succinctly by Duncan Dickinson

Groovy is a well-established programming language that offers a number of advantages to developers who want a reliable language with a mature community. With Groovy Succinctly, Duncan Dickinson will introduce Groovy to programmers of all skill levels. Readers will learn the basics of Groovy and will learn how to develop practical applications with its unique features.
Development General Programming Groovy

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