ng2 AutocompletePipe

AutocompletePipe.ts

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

@Pipe({ name: 'autocomplete' })
export class AutocompletePipe implements PipeTransform {
  transform(value: string[], args: string[]): any {
    debugger;
    if (!value) return value;
    let ws = value.sort();
    let as = args[0].split('');
    as.push("PAUSE");

    let m = {}
      , n = {}
      , f = s => m[s] ? m[s] : m[s] = g(s[0] || '').filter(w => w.startsWith(s))
      , g = c => n[c] ? n[c] : n[c] = ws.filter(w => w.startsWith(c))
      , r = []
      , s = ''
    as.forEach(a => {
      if (a === 'BACKSPACE') s = s.slice(0, -1)
      else if (a === 'PAUSE') r.push(f(s))
      else s += a
    })
    return r
  }

  autocomplete(ws, as) {
  }
}