变量、注释与类型

变量

声明变量

var a = 10; // 动态类型
int b = 20; // 静态类型
var c; // 先声明
int d; // 先声明
print(a);
print(b);

c = 30; // 后赋值
d = 40; // 后赋值
print(c);
print(d);

数据类型

• Numbers (int, double)
• Strings (String)
• Booleans (bool)
• Records ((value1, value2))
• Lists (List, also known as arrays)
• Sets (Set)
• Maps (Map)
• Runes (Runes; often replaced by the - characters API)
• Symbols (Symbol)
• The value null (Null)