feat: capitalization algorithm

Author: francislagares

src/algorithms/capitalize/capitalize.ts

@@ -0,0 +1,25 @@
+// Option 1
+export const capitalize = (str: string) => {
+  const words = [];
+
+  for (const word of str.split(' ')) {
+    words.push(word[0].toUpperCase() + word.slice(1));
+  }
+
+  return words.join(' ');
+};
+
+// Option 2
+export const capitalizeString = (str: string) => {
+  let result = str[0].toUpperCase();
+
+  for (let i = 1; i < str.length; i++) {
+    if (str[i - 1] === ' ') {
+      result += str[i].toUpperCase();
+    } else {
+      result += str[i];
+    }
+  }
+
+  return result;
+};

src/algorithms/capitalize/tests/capitalize.test.ts

@@ -0,0 +1,17 @@
+import { capitalize, capitalizeString } from '../capitalize';
+
+describe('Capitalize Algorithm', () => {
+  test('Capitalize is a function', () => {
+    expect(typeof capitalize).toEqual('function');
+    expect(typeof capitalizeString).toEqual('function');
+  });
+
+  test('capitalizes the first letter of every word', () => {
+    expect(capitalize('hi there, how is it going?')).toEqual(
+      'Hi There, How Is It Going?',
+    );
+    expect(capitalizeString('hi there, how is it going?')).toEqual(
+      'Hi There, How Is It Going?',
+    );
+  });
+});