feat: add a first generic method, square (#10)

Resolves #2.

Reviewed-on: #10
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>

src/generic/__test__/arithmetic.spec.js

@@ -0,0 +1,11 @@
+import assert from 'assert'
+import math from '#nanomath'
+
+describe('generic arithmetic', () => {
+   it('squares anything', () => {
+      assert.strictEqual(math.square(7), 49)
+      assert.strictEqual(
+         math.square.resolve([math.types.Number]).returns,
+         math.types.Number)
+   })
+})

src/generic/all.js

@@ -0,0 +1 @@
+export * as arithmetic from './arithmetic.js'

src/generic/arithmetic.js

@@ -0,0 +1,8 @@
+import {onType} from '#core/helpers.js'
+import {Returns} from '#core/Type.js'
+import {Any} from '#core/TypePatterns.js'
+
+export const square = onType(Any, (math, T) => {
+   const mult = math.multiply.resolve([T, T])
+   return Returns(mult.returns, a => mult(a, a))
+})