feat: add pipe to upper only the first letter in a string

src/app/pipes/upperfirst-pipe.spec.ts

@@ -0,0 +1,21 @@
+import { UpperfirstPipe } from './upperfirst-pipe';
+
+describe('UpperfirstPipe', () => {
+  let pipe: UpperfirstPipe;
+
+  beforeEach(() => {
+    pipe = new UpperfirstPipe();
+  });
+
+  it('create an instance', () => {
+    const pipe = new UpperfirstPipe();
+    expect(pipe).toBeTruthy();
+  });
+
+  it('should uppercase only the first letter on a string', () => {
+    const unformattedString = "today is a great day";
+    const expectedString = "Today is a great day";
+    expect(pipe.transform(unformattedString)).toBe(expectedString);
+  });
+
+});

src/app/pipes/upperfirst-pipe.ts

@@ -0,0 +1,14 @@
+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({
+  name: 'upperfirst'
+})
+export class UpperfirstPipe implements PipeTransform {
+
+  transform(value: string,) {
+    const upperFirst = value[0].toUpperCase();
+    value = value.slice(1);
+    return upperFirst + value;
+  }
+
+}