some html code...
<app-new-task [_id]="Lead._id"></app-new-task>

import { Component, OnInit, Input } from '@angular/core';
...
@Input() _id: string;

ngOnInit() {
    this.someFunction(this._id);
  }

someFunction(somearg) {
...
}

ZoneAwarePromise {__zone_symbol__state: null, __zone_symbol__value: Array(0)}