Skip to content

Latest commit

 

History

History
133 lines (100 loc) · 4.16 KB

runtime-types.md

File metadata and controls

133 lines (100 loc) · 4.16 KB
Raw

uGO Runtime Types

  • int: signed 64bit integer (int64 in Go)
  • uint: unsigned 64bit integer (uint64 in Go)
  • float: 64bit floating point (float64 in Go)
  • bool: boolean (bool in Go)
  • char: character (rune in Go)
  • string: string (string in Go)
  • bytes: byte array ([]byte in Go)
  • array: objects array ([]Object in Go)
  • map: objects map with string keys (map[string]Object in Go)
  • error: an error with a string Name and Message
  • undefined: undefined

Note: uGO does not have byte type. uint, int or string values can be used to create/modify bytes values.

Go Type Definitions

  • int
type Int int64
  • uint
type Uint uint64

Note: uint values can be represented by adding u suffix to integer values.

  • float
type Float float64
  • bool
type Bool bool
  • char
type Char rune
  • string
type String string
  • bytes
type Bytes []byte
  • error
type Error struct {
  Name    string
  Message string
  Cause   error
}
  • array
type Array []Object
  • map
type Map map[string]Object
  • syncMap
type SyncMap struct {
  mu sync.RWMutex
  Map
}

Type Conversion/Coercion Table

int uint float bool char string bytes array map error undefined
int - uint64(v) float64(v) !IsFalsy() rune(v) strconv X X X String() X
uint int64(v) - float64(v) !IsFalsy() rune(v) strconv X X X String() X
float int64(v) uint64(v) - !IsFalsy() rune(v) strconv X X X String() X
bool 1 / 0 1 / 0 1.0 / 0.0 - 1 / 0 "true" / "false" X X X String() X
char int64(v) uint64(v) float64(v) !IsFalsy() - string(v) X X X String() X
string strconv strconv strconv !IsFalsy() utf8. DecodeRuneInString(v) - []byte(v) X X String() X
bytes X X X !IsFalsy() X string(v) - X X String() X
array X X X !IsFalsy() X String() X - X String() X
map X X X !IsFalsy() X String() X X - String() X
error X X X X X String() X X X - X
undefined X X X !IsFalsy() X String() X X X X -
  • X: No conversion. Conversion function will throw runtime error, TypeError.
  • strconv: converted using Go's conversion functions from strconv package.
  • IsFalsy(): use Object.IsFalsy() function.
  • String(): use Object.String() function.

Object.IsFalsy()

Object.IsFalsy() interface method is used to determine if a given value should evaluate to false (e.g. for condition expression of if statement).

  • int: v == 0
  • uint: v == 0
  • float: math.IsNaN(v)
  • bool: !v
  • char: v == 0
  • string: len(v) == 0
  • bytes: len(v) == 0
  • array: len(v) == 0
  • map: len(v) == 0
  • error: true (error is always falsy)
  • undefined: true (undefined is always falsy)

See builtins for conversion and type checking functions