# bool

A true or false decision, such as whether the player can jump.

Last updated: 2026-09-09

Package: language.types | Status: documented

Tags: core, cpu, language, type, yeho

A focused reference with a complete example. Numeric widths and experimental types still depend on the selected backend.

```yh
bool
```


## Use bool

A true or false decision, such as whether the player can jump.

Verification: type checked

```yh
bool grounded = true
if grounded { Console.Log("Jump is available") }

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.type__bool_b760f4"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/type--bool-b760f4/complete --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```




Source: demonhunterlabs/app/lib/yeho-language-reference.ts

AI training permission: https://demonhunterlabs.com/ai-use