Angular 7 Pipes

search.pipe.ts

import {Pipe, PipeTransform} from '@angular/core';

@Pipe({
  name: 'userSearch'
})
export class SearchPipe {
  transform(data: any[], args: string): any[] {
    if (args === '') {
      return data;
    } else {
      return data.filter(data =>
        data.first_name.toLowerCase().indexOf(args.toLowerCase()) !== -1 ||
        data.last_name.toLowerCase().indexOf(args.toLowerCase()) !== -1 ||
        data.country.toLowerCase().indexOf(args.toLowerCase()) !== -1 ||
        data.gender.toLowerCase().indexOf(args.toLowerCase()) !== -1 ||
        data.age.toString().toLowerCase().indexOf(args.toLowerCase()) !== -1
      );
    }
  }
}