Angular unique pipe apply any object

import { element } from 'protractor';

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

@Pipe({

name: "unique",

pure: false

})

export class UniquePipe implements PipeTransform {

transform(value: any, level0?: any, level1?: any, level2?: any): any {

let f = [];

if (!Array.isArray(value)) return;

f = value.filter((n: any) => {

if (!n[level0]) return;

if (level1 == null && level2 == null) {

if (n[level0] === 0 || n[level0]) {

return f.indexOf(n[level0]) === -1 && f.push(n[level0]);

}

} else if (level2 == null) {

if (n[level0][level1] === 0 || n[level0][level1]) {

return (

f.indexOf(n[level0][level1]) === -1 && f.push(n[level0][level1])

);

}

} else {

if (n[level0][level1][level2] === 0 || n[level0][level1][level2]) {

return (

f.indexOf(n[level0][level1][level2]) === -1 &&

f.push(n[level0][level1][level2])

);

}

}

});

return f;

}

}