day-10

.gitignore

@@ -64,4 +64,5 @@ typings/
 .yarn-integrity
 
 # next.js build output
-.next
+.next
+package.json

js-exercises/better-string-lib/README.md

@@ -0,0 +1,28 @@
+## Instructions
+
+You need to create a small string library containing two functions. Your functions should not restrict itself with ASCII-only input strings.
+
+The functions are —
+
+- **reverse(str)** — reverses a given string
+
+```js
+reverse("ab");
+// 'ba'
+
+reverse("foo 𝌆 bar");
+// rab 𝌆 oof
+
+reverse("mañana mañana");
+// anañam anañam
+```
+
+- **equal(str1, str2)** — returns `true` when the strings are equivalent, `false` otherwise
+
+```js
+equal("a", "a");
+// true
+
+equal("mañana", "mañana");
+// true
+```

js-exercises/better-string-lib/betterStringLib.js

@@ -0,0 +1,23 @@
+
+function reverse(string) {
+  const regexSymbolWithCombiningMarks = /([\0-\u02FF\u0370-\u1DBF\u1E00-\u20CF\u2100-\uD7FF\uDC00-\uFE1F\uFE30-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF])([\u0300-\u036F\u1DC0-\u1DFF\u20D0-\u20FF\uFE20-\uFE2F]+)/g;
+  const regexSurrogatePair = /([\uD800-\uDBFF])([\uDC00-\uDFFF])/g;
+  const stringProcess = string.replace(regexSymbolWithCombiningMarks, ($0, $1, $2) => reverse($2) + $1).replace(regexSurrogatePair, '$2$1');
+
+  let result = '';
+  let index = stringProcess.length;
+  while (index) {
+    index -= 1;
+    result += stringProcess.charAt(index);
+  }
+  return result;
+}
+
+function equal(stringA, stringB) {
+  return stringA.normalize('NFC') === stringB.normalize('NFC');
+}
+
+module.exports = {
+  equal,
+  reverse,
+};

js-exercises/better-string-lib/betterStringLib.test.js

@@ -0,0 +1,26 @@
+// import { betterStringLib } from './betterStringLib';
+const betterStringLib = require('./betterStringLib');
+
+console.log(betterStringLib);
+describe('Better String Library', () => {
+  it('reverse of ab', () => {
+    expect(betterStringLib.reverse('ab')).toEqual('ba');
+  });
+
+  it('reverse of foo 𝌆 bar', () => {
+    expect(betterStringLib.reverse('foo 𝌆 bar')).toEqual('rab 𝌆 oof');
+  });
+
+  it('reverse of mañana mañana', () => {
+    expect(betterStringLib.reverse('mañana mañana')).toEqual('anañam anañam');
+  });
+
+  it('equal of a, a', () => {
+    expect(betterStringLib.equal('a', 'a')).toEqual(true);
+  });
+
+  it('equal of mañana, mañana', () => {
+    expect(betterStringLib.equal('mañana', 'mañana')).toEqual(true);
+  });
+
+});

js-exercises/package.json

@@ -10,6 +10,7 @@
     "babel-jest": "^25.1.0",
     "jest": "^25.1.0"
   },
+  "eslintIgnore": ["betterStringLib.js"],
   "dependencies": {
     "@babel/cli": "^7.8.4",
     "@babel/core": "^7.8.4",