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begin to document all kernel function in elm/core #57

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begin to document all kernel function in elm/core
harrysarson Aug 13, 2019
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Add bitwise functions
harrysarson Aug 13, 2019
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begin to document platform module
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62 changes: 62 additions & 0 deletions docs/core/kernel-code.md
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# Kernel functions in `elm/core`

This documents lists all kernel functions defined in JavaScript files contained within `src/Elm/Kernel/`.
Each row in the table corresponds to a function, each kernel module (a JavaScript file) will span multiple rows, one for each function defined in that module.

These kernel functions are private to `elm/core` and thus they can only be called by other functions in `elm/core`.
The last column of the table contains a best effort to exhustively list all the places that call each kernel function.

# List of all kernel functions

| Module | Function | Notes | Used by |
| ------------------------- | ------------- | ------------- | ------------- |
| `Elm.Kernel.Basics` | `add` | [1](###1) | `Basics.add` |
| | `sub` | [1](###1) | `Basics.sub` |
| | `mul` | [1](###1) | `Basics.mul` |
| | `fdiv` | [1](###1) | `Basics.fdiv` |
| | `idiv` | [1](###1) | `Basics.idiv` |
| | `pow` | [1](###1) | `Basics.pow` |
| | `pow` | todo... |
| | `remainderBy` | todo... |
| | `modBy` | todo... |
| | `pi` | todo... |
| | `e` | todo... |
| | `cos` | todo... |
| | `sin` | todo... |
| | `tan` | todo... |
| | `acos` | todo... |
| | `asin` | todo... |
| | `atan` | todo... |
| | `atan2` | todo... |
| | `toFloat` | todo... |
| | `truncate` | todo... |
| | `isInfinite` | todo... |
| | `ceiling` | todo... |
| | `floor` | todo... |
| | `round` | todo... |
| | `sqrt` | todo... |
| | `log` | todo... |
| | `isNaN` | todo... |
| | `not` | todo... |
| | `and` | todo... |
| | `or` | todo... |
| | `xor` | todo... |
| `Elm.Kernel.Bitwise` | todo... |
| `Elm.Kernel.Char` | todo... |
| `Elm.Kernel.Debug` | todo... |
| `Elm.Kernel.JsArray` | todo... |
| `Elm.Kernel.List` | todo... |
| `Elm.Kernel.Platform` | todo... |
| `Elm.Kernel.Process` | todo... |
| `Elm.Kernel.Scheduler` | todo... |
| `Elm.Kernel.String` | todo... |
| `Elm.Kernel.Utils` | todo... |

## Notes

### 1

For elm code like `x + y` or `time / 60`, the official compiler generates javascript using the operators directly.
These functions will only be called if the user does `add x y` or `fdiv time 60`.
I (Harry Sarson) belive that `Basics.add` calls `Elm.Kernel.Basics.add` entirely so that the type resolution part of the compiler can treat `(+)` as an operator defined by `infix left 6 (+) = add`.
The code generation part of the compiler then special cases these operators.