摘要: American Standard Code for Information Interchange (ASCII), pronounced /??ski/ is a character-encoding scheme based on the ordering of the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that work with text. ASCII includes definitions for 128 characters: 33 are non-printing control characters (number 0 to 31 and 127), now mostly obsolete that affect how text is processed; 94 are printable characters (numbers 32 to 126), and the space is cons 閱讀全文
摘要: In Groovy we can group the elements of a Collection type in a map. We define the rule for grouping with a closure. The result is a map where the key is the grouping condition and the value contains the elements of the Collection type belonging to the key. Let's see the groupBy method in action: 閱讀全文
摘要:
Constructors in Groovy can be invoked in a classic Java way, but we can also use lists or maps to create objects. Groovy supports an explicit coersion of a list to a constructor with the as keyword. Or we can rely on the implicit coersion when Groovy looks at the type of the variable to automatically convert the list to the right constructor call. 閱讀全文
摘要: Groovy has some features and methods we can categorize as functional programming. The inject() method is a so called higher-order function. Other languages call it a fold, reduce or accumulate. The inject() method processes a data structure with a closure and builds up a return value. The first parameter of the inject() method is the first value of the intermediary results of the second parameter: the closure. When we use the inject() we don't introduce any side effects, because we build up the 閱讀全文