Below is the API for the OCaml standard library. It's directly copied over from the OCaml Manual, formatted to the Reason syntax and styled accordingly. The API docs are work-in-progress; we'll be polishing these gradually!

If you're targeting JavaScript, the API docs for BuckleScript includes all of below, plus JS-specific APIs.

`module Int32: sig .. end`

32-bit integers.

This module provides operations on the type `int32`

of signed 32-bit integers. Unlike the built-in `int`

type,
the type `int32`

is guaranteed to be exactly 32-bit wide on all
platforms. All arithmetic operations over `int32`

are taken
modulo 2^{32}.

Performance notice: values of type `int32`

occupy more memory
space than values of type `int`

, and arithmetic operations on
`int32`

are generally slower than those on `int`

. Use `int32`

only when the application requires exact 32-bit arithmetic.

```
let zero: int32;
```

The 32-bit integer 0.

```
let one: int32;
```

The 32-bit integer 1.

```
let minus_one: int32;
```

The 32-bit integer -1.

```
let neg: int32 => int32;
```

Unary negation.

```
let add: int32 => int32 => int32;
```

Addition.

```
let sub: int32 => int32 => int32;
```

Subtraction.

```
let mul: int32 => int32 => int32;
```

Multiplication.

```
let div: int32 => int32 => int32;
```

Integer division. Raise

`Division_by_zero`

if the second
argument is zero. This division rounds the real quotient of
its arguments towards zero, as specified for `Pervasives.(/)`

.```
let rem: int32 => int32 => int32;
```

Integer remainder. If

`y`

is not zero, the result
of `Int32.rem x y`

satisfies the following property:
`x = Int32.add (Int32.mul (Int32.div x y) y) (Int32.rem x y)`

.
If `y = 0`

, `Int32.rem x y`

raises `Division_by_zero`

.```
let succ: int32 => int32;
```

Successor.

`Int32.succ x`

is `Int32.add x Int32.one`

.```
let pred: int32 => int32;
```

Predecessor.

`Int32.pred x`

is `Int32.sub x Int32.one`

.```
let abs: int32 => int32;
```

Return the absolute value of its argument.

```
let max_int: int32;
```

The greatest representable 32-bit integer, 2^{31} - 1.

```
let min_int: int32;
```

The smallest representable 32-bit integer, -2^{31}.

```
let logand: int32 => int32 => int32;
```

Bitwise logical and.

```
let logor: int32 => int32 => int32;
```

Bitwise logical or.

```
let logxor: int32 => int32 => int32;
```

Bitwise logical exclusive or.

```
let lognot: int32 => int32;
```

Bitwise logical negation

```
let shift_left: int32 => int => int32;
```

`Int32.shift_left x y`

shifts `x`

to the left by `y`

bits.
The result is unspecified if `y < 0`

or `y >= 32`

.```
let shift_right: int32 => int => int32;
```

`Int32.shift_right x y`

shifts `x`

to the right by `y`

bits.
This is an arithmetic shift: the sign bit of `x`

is replicated
and inserted in the vacated bits.
The result is unspecified if `y < 0`

or `y >= 32`

.```
let shift_right_logical: int32 => int => int32;
```

`Int32.shift_right_logical x y`

shifts `x`

to the right by `y`

bits.
This is a logical shift: zeroes are inserted in the vacated bits
regardless of the sign of `x`

.
The result is unspecified if `y < 0`

or `y >= 32`

.```
let of_int: int => int32;
```

Convert the given integer (type

`int`

) to a 32-bit integer
(type `int32`

).```
let to_int: int32 => int;
```

Convert the given 32-bit integer (type ^{31}, i.e. the high-order bit is lost
during the conversion. On 64-bit platforms, the conversion
is exact.

`int32`

) to an
integer (type `int`

). On 32-bit platforms, the 32-bit integer
is taken modulo 2```
let of_float: float => int32;
```

Convert the given floating-point number to a 32-bit integer,
discarding the fractional part (truncate towards 0).
The result of the conversion is undefined if, after truncation,
the number is outside the range [

`Int32.min_int`

, `Int32.max_int`

].```
let to_float: int32 => float;
```

Convert the given 32-bit integer to a floating-point number.

```
let of_string: string => int32;
```

Convert the given string to a 32-bit integer.
The string is read in decimal (by default) or in hexadecimal,
octal or binary if the string begins with

`0x`

, `0o`

or `0b`

respectively.
Raise `Failure "int_of_string"`

if the given string is not
a valid representation of an integer, or if the integer represented
exceeds the range of integers representable in type `int32`

.```
let to_string: int32 => string;
```

Return the string representation of its argument, in signed decimal.

```
let bits_of_float: float => int32;
```

Return the internal representation of the given float according
to the IEEE 754 floating-point 'single format' bit layout.
Bit 31 of the result represents the sign of the float;
bits 30 to 23 represent the (biased) exponent; bits 22 to 0
represent the mantissa.

```
let float_of_bits: int32 => float;
```

Return the floating-point number whose internal representation,
according to the IEEE 754 floating-point 'single format' bit layout,
is the given

`int32`

.```
type t = int32;
```

An alias for the type of 32-bit integers.

```
let compare: t => t => int;
```

The comparison function for 32-bit integers, with the same specification as

`Pervasives.compare`

. Along with the type `t`

, this function `compare`

allows the module `Int32`

to be passed as argument to the functors
`Set.Make`

and `Map.Make`

.```
let format: string => int32 => string;
```