feat: First commit.

src/index.spec.ts

@@ -0,0 +1,55 @@
+import { describe, expect, it } from 'vitest';
+import fc from 'fast-check';
+import {
+  afterFirstWord, beforeFirstWord, endsWith, ltrim, startsWith,
+} from './index';
+
+describe('strings', () => {
+//   describe('afterFirstWord', () => {
+    // it('removes the first word', () => {
+    //   fc.assert(fc.property(fc.string(), (str) => {
+    //     const got = afterFirstWord(str);
+
+    //     if (got !== '') {
+    //       expect(endsWith(got, str)).toBe(true);
+    //       if (str.indexOf(' ') !== -1) {
+    //         expect(`${beforeFirstWord(str)} ${got}`).toBe(str);
+    //       }
+    //     }
+    //   }));
+    // });
+//   });
+  describe('ltrim', () => {
+    it('returns input when cutset is empty', () => {
+      expect(ltrim('', 'foo')).toBe('foo');
+    });
+    it('returns empty when input is empty', () => {
+      expect(ltrim('foo', '')).toBe('');
+    });
+    it('can be curried', () => {
+      expect(ltrim('foo', '')).toBe(ltrim('foo')(''));
+      expect(ltrim(' ', 'foo')).toBe(ltrim(' ')('foo'));
+    });
+    it('trims cutset', () => {
+      fc.assert(fc.property(fc.string(), fc.string(), (cutset, str) => {
+        const got = ltrim(cutset, str);
+
+        if (cutset === '') {
+          expect(got).toBe(str);
+        } else if (str === '') {
+          expect(got).toBe('');
+        } else {
+          if (got === '') {
+            for (const char of str) {
+              expect(cutset).contains(char);
+            }
+          }
+
+          for (const char of cutset) {
+            expect(startsWith(char, got)).toBe(false);
+          }
+        }
+      }));
+    });
+  });
+});