An Angular 2 pipe to capitalize the first letter of a string value.

capitalizefirst.pipe.ts

import { Pipe, PipeTransform } from '@angular/core';
/*
 * Capitalize the first letter of the string
 * Takes a string as a value.
 * Usage:
 *  value | capitalizefirst
 * Example:
 *  // value.name = daniel
 *  {{ value.name | capitalizefirst  }}
 *  fromats to: Daniel
*/
@Pipe({
  name: 'capitalizeFirst'
})
export class CapitalizeFirstPipe implements PipeTransform {
  transform(value: string, args: any[]): string {
    if (value === null) return 'Not assigned';
    return value.charAt(0).toUpperCase() + value.slice(1);
  }
}

Line 17:
Use
if (!value) return null;
Instead of
if (value === null) return 'Not assigned';

Nope, that would empty the 0 input.
Use

if (value === null || value === undefined) {
            return '';
        }