Choose a numeric type
| Family | Types | Arithmetic |
|---|---|---|
| Unsigned integers | u8, u16, u32, u64, u128 | Exact, with overflow checks |
| Signed integers | i8, i16, i32, i64, i128 | Exact, with overflow checks |
| Binary floats | f16, f32, f64, f128 | Rounded at the declared precision; finite values only |
Devices
Use this scene on another device
Show a QR code for your glasses, or send a link to another browser. You can keep working here.
Sharing starts a fresh run of the last compiled code. Your editor draft stays here.
Join a session
Open an invitation link, or paste a link or code from the other device.
Connect your other device
On RayNeo, open Menu → Connect live and scan this code. In another browser, open the invitation link below.
Or enter this code:
Waiting for another device. You can keep working while it connects.
Browsers can edit code; every device can use scene controls. The device that started the session controls playback.
Connection settings
A full invitation link includes its host. With a code alone, both devices need the same live host. Pairing setup
main.kj
Loading…Drag to orbit · select to inspect
0 entities
Scene controls
Loading the language runtime…
Output 0
No output.
State
Compile source to inspect its values.
TraceNo execution yet
- Executed source spans appear here.
A literal takes its type from a field, argument, return type, binding annotation,
or typed operand. Without numeric context, it defaults to f64; Number is a
compatibility spelling of f64. Use value.convert[T]() for an explicit checked
conversion. It returns Res[T, DataError]; overflow, fractional float-to-integer
conversion, and lost precision are data errors.
Use data methods
Data operations belong to the value they read or transform. The fixture prints
3, Some(2), [2, 2], 10, 255, and café. Change the final byte and
Run to see Bin.decode() return a matchable DataError instead of an exception.
Devices
Use this scene on another device
Show a QR code for your glasses, or send a link to another browser. You can keep working here.
Sharing starts a fresh run of the last compiled code. Your editor draft stays here.
Join a session
Open an invitation link, or paste a link or code from the other device.
Connect your other device
On RayNeo, open Menu → Connect live and scan this code. In another browser, open the invitation link below.
Or enter this code:
Waiting for another device. You can keep working while it connects.
Browsers can edit code; every device can use scene controls. The device that started the session controls playback.
Connection settings
A full invitation link includes its host. With a code alone, both devices need the same live host. Pairing setup
main.kj⌘ / Ctrl + Enter
Loading…Drag to orbit · select to inspect
0 entities
Scene controls
Loading the language runtime…
Output 0
No output.
State
Compile source to inspect its values.
TraceNo execution yet
- Executed source spans appear here.
| Receiver | Methods |
|---|---|
Str | len(), utf8(), get(index) -> Opt[Str] |
Bin | len(), decode() -> Res[Str, DataError], get(index) -> Opt[u8] |
List[T] | len(), append(value), get(index) -> Opt[T] |
Tensor[T] | len(), shape(), reshape(...), transpose(...), sum(), matmul(...), get(indices), convert[U]() |
Str is immutable UTF-8 text and Bin is immutable bytes. Str.utf8() makes
the encoding boundary explicit; Bin.decode() checks it. get returns Some
or None for an absent index. Global len, utf8, decode, append,
shape, reshape, transpose, sum, matmul, and convert calls are not
part of the language API. print, range, and tensor constructors remain
top-level operations; tensor[T](values, shape) returns a checked
Res[Tensor[T], DataError].
Checked operations return values the caller can match or propagate. A failed runtime operation never silently wraps or substitutes a value; a failed action or lifecycle transaction preserves the previously accepted state.