Dart identical用法及代碼示例

檢查兩個引用是否指向同一個對象。

例子：

var o = new Object();
var isIdentical = identical(o, new Object()); // false, different objects.
isIdentical = identical(o, o); // true, same object
isIdentical = identical(const Object(), const Object()); // true, const canonicalizes
isIdentical = identical([1], [1]); // false
isIdentical = identical(const [1], const [1]); // true
isIdentical = identical(const [1], const [2]); // false
isIdentical = identical(2, 1 + 1); // true, integers canonicalizes