Angular 2+ Search Pipe

searchfilter.pipe.ts

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({name: 'searchFilter'})
export class SearchFilterPipe implements PipeTransform {
  iterate(obj, searchText) {
    for (let property in obj) {
      if (obj.hasOwnProperty(property)) {
        if (typeof obj[property] === "object") {
          if (this.iterate(obj[property], searchText)){
            return true;
          }
        } else {
           if (String(obj[property]).toLowerCase().includes(searchText)){
             return true;
           }
        }
      }
    }
    return false;
  }
  transform(items: any[], searchText: string): any[] {
    if(!items) return [];
    if(!searchText) return items;
    searchText = searchText.toLowerCase();
    return items.filter( it => {
      switch(typeof(it)){
        case 'string':
          return it.toLowerCase().includes(searchText);
        case 'object':
          return this.iterate(it, searchText);
      }
    });
  }
}