数据类型

• Null: 空类型
• Bool: 布尔变量
• Integer：整数变量
• Double：浮点数变量
• String：字符串变量
• Function：函数
• Array：数组
• HashMap：哈希表

Null空类型

null表示空:

>> isNull([1,2,3][1])
false

>> isNull([1,2,3][3])
true

Bool布尔变量

true表示真，false表示假:

>> true
true
>> false
false
>> !true
false
>> !false
true
>> !!true
true

Integer整数变量

>> let num = 1;
1
>> let num = 3 + 4;
7
>> let num = num + 5;
12

>> let a1 = 3
3
>> let a_1b = 4
4
>> a1 + a_1b
7

Double浮点数变量

>> 3.14159
3.141590

>> let a = 2 + 1.0
3.000000

>> let a = a - 1.5
1.500000

>> 10/2
5

>> 10/2.0
5.000000

>> 10/0
Woops! Executing bytecode failed:
ERROR: error operator: / can not div 0

>> 10/0.0
Woops! Executing bytecode failed:
ERROR: error operator: / can not div 0.000000

String字符串变量

>> let name = "Ledge";
"Ledge"
>> let name = "Hello " + "Ledge!";
"Hello Ledge!"

Function函数

• def关键字用于定义命名函数:

>> def add(x, y){ x + y; }
Closure[0x6000019d40b8]
>> add(3,4)
7

• lambda关键字用于定义匿名函数:

>> let add = lambda(x, y){ x + y; }
Closure[0x6000019d40b8]
>> add(3,4)
7

Array数组

数组的元素可以是任何类型:

>> let array = [1, "hello", true, !true, "hello" + "world"]
[1, "hello", true, false, "helloworld"]
>> let a = array[0]
1

HashMap字典

字典的key和value可以是任何类型:

>> let map = {1: "hello", "world": true, false: 3+5}
{false: 8, 1: "hello", "world": true}
>> map[false]
8
>> map[9]
null