Removed in version 5.5.0p1

GameObject.particleSystem

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Obsolete public var particleSystem: Component;

Obsolete public Component particleSystem;

Description

The ParticleSystem attached to this GameObject (Read Only). (Null if there is none attached).

var other : GameObject; 
other.particleSystem.Emit(5);

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public GameObject other;
    void Example() {
        other.particleSystem.Emit(5);
    }
}