Basic Types

Ints are signed 32-bit integers.

Numbers are signed 64-bit double precision.

1.234

Kaiper has the null value.

null

Boolean values true and false are present in Kaiper.

true
false

Kaiper supports strings encoded in UTF-8, which are created by writing text between single or double quotes.

Double quoted strings support interpolation, while single quoted strings do not.

"Hello, the value of PI is ${Math.PI}"
'I'm also a valid string, but I can't do interpolation!'

Arrays are denoted by enclosing square brackets in Kaiper. The contents can be of any type.

[1, 2.5, 3, true, "hello", "world"]

# Get index
array[0]

# Set index
array[0] = "Hello"

Dictionaries are Kaiper's maps. The keys and values can be of any type.

["key": "value", 1: 2]

# Get values
map["key"]
map[1]

# Set values
map["key"] = "value"
map[1] = 2

Tuples are like arrays; they can hold any values. They are created by simply joining 2 elements with a comma ,.

1, 2, 3, true

Tuple values can be named. However, you can not mix positional and named tuple pairs.

// Valid
1, 2, 3, a: 4, b: 5
x: 1, y: 2, z: 3

// Invalid
x: 1, 2

Functions are first class constructs in Kaiper. More information on the Functions wiki page.

def(args...) { expr }
def(args...) = expr
def { args... -> expr }
def _ + 0

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