Angular 2 pipe to transform string to Title Case

titlecase.pipe.ts

import {Pipe, PipeTransform} from 'angular2/core';

/*
 * Changes the case of the first letter of a given number of words in a string.
*/

@Pipe({name: 'titleCase', pure: false})
export class TitleCase implements PipeTransform {
    transform(input:string, length: number): string{
        return input.length > 0 ? input.replace(/\w\S*/g, (txt => txt[0].toUpperCase() + txt.substr(1).toLowerCase() )) : '';
    }
}