Implement isNumber pipe

src-ui/src/app/pipes/is-number.pipe.spec.ts

@@ -0,0 +1,13 @@
+import { IsNumberPipe } from './is-number.pipe'
+
+describe('IsNumberPipe', () => {
+  it('should detect numbers', () => {
+    const pipe = new IsNumberPipe()
+    expect(pipe.transform(0)).toBeTruthy()
+    expect(pipe.transform(123)).toBeTruthy()
+    expect(pipe.transform('123')).toBeFalsy()
+    expect(pipe.transform(null)).toBeFalsy()
+    expect(pipe.transform(undefined)).toBeFalsy()
+    expect(pipe.transform(NaN)).toBeFalsy()
+  })
+})

src-ui/src/app/pipes/is-number.pipe.ts

@@ -0,0 +1,10 @@
+import { Pipe, PipeTransform } from '@angular/core'
+
+@Pipe({
+  name: 'isNumber',
+})
+export class IsNumberPipe implements PipeTransform {
+  transform(value: any): boolean {
+    return typeof value === 'number' && !isNaN(value)
+  }
+}