feat: adding between (#3)

src/between.test.ts

@@ -0,0 +1,8 @@
+import * as $ from './index.js'
+
+test('between', () => {
+  expect($.between(1, 3)(2)).toEqual($.ok(2))
+  expect($.between(1, 3)(1)).toEqual($.ok(1))
+  expect($.between(1, 3)(3)).toEqual($.ok(3))
+  expect($.between(1, 3)(0)).toEqual($.fail(0, 'expected number between 1 and 3'))
+})

src/between.ts

@@ -0,0 +1,10 @@
+import { ok, fail, type Refute } from './index.js'
+
+export const between =
+  (min: number, max: number): Refute<number> =>
+    value =>
+      typeof value === 'number' && value >= min && value <= max ?
+        ok(value) :
+        fail(value, `expected number between ${min} and ${max}`)
+
+export default between

src/index.ts

@@ -1,6 +1,7 @@
 import and from './and.js'
 import array from './array.js'
 import assert from './assert.js'
+import between from './between.js'
 import bigint_ from './bigint.js'
 import boolean_ from './boolean.js'
 import calendarDate from './calendar-date.js'
@@ -46,6 +47,7 @@ export {
   and,
   array,
   assert,
+  between,
   bigint_ as bigint,
   boolean_ as boolean,
   calendarDate,