Builtins内置函数

• type(): 查看对象类型
• id(): 查看对象id
• print(): 打印对象
• isNull(): 判断对象是否有效
• len(): 列表或字符串长度
• delete(): 删除对象
• globals(): 全局空间

• locals(): 本地空间

• first()

• last()
• rest()
• push()
• fibonacci()

type()

>> type([1,2])
"LIST"

>> type(type)
"BUILTIN"

id()

>> let name = 'Ledge'
"Ledge"

>> type(name)
"STRING"

>> id(name)
105553160290392

print()

>> print("Hello", "Ledge")
"Hello"
"Ledge"
null

isNull()

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

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

len()

>> len("hello")
5
>> len([1,2,3])
3
>> len("你好")
2

delete()

>> let a = 5
5
>> a
5
>> delete(a)
>> a
Woops! Compilation failed:
ERROR: undefined variable a

globals()

>> let a = [1,2]; let b=3.14; let c = {1:2}
{1: 2}

>> globals()
{"a": [1, 2], "b": 3.140000, "c": {1: 2}}

locals()

>> let a = [1,2]; let b=3.14; let c = {1:2}
{1: 2}

>> globals()
{"a": [1, 2], "b": 3.140000, "c": {1: 2}}

>> locals()
{"a": [1, 2], "b": 3.140000, "c": {1: 2}}

>> def test(){ let a = 100; locals()}
Closure[0x600001658978]

>> test()
{"a": 100}

>> globals()
{"a": [1, 2], "b": 3.140000, "test": Closure[0x600001658978], "c": {1: 2}}

first()

>> first([1,2,3])
1

last()

>> last([1,2,3])
3

rest()

>> rest([1,2,3])
[2, 3]

push()

>> push([1,2,3], 4)
[1, 2, 3, 4]

fibonacci()

>> fibonacci(35)
9227465