# Avoid these methods and situations in PSce

### PCse runs each node. And each node has different time period (in terms of miliseconds) if we consider milisecond time tick.

<mark style="color:blue;">So ,</mark> <mark style="color:red;">**We dont recommended**</mark> <mark style="color:blue;">that use below methods which depend on your condition</mark>

<mark style="color:blue;">**Please do not leave unused variables in PSce.**</mark>&#x20;

```
// defining V (variable)
let V={};
.
.
.
(V has not been used anywhere, it has been only defined)
```

<mark style="color:red;">**if you wont use the V variable next codes, system might be occurred an error.**</mark>

**1- Math.random()** **or depends on this** **method**&#x20;

<mark style="color:blue;">**You can use Tools.getRandom() which can generate 6 digits random number each 30 seconds.**</mark>

**2- new Date().getTime()** &#x20;

in PSce's. Because each node generates different random number and different time Ticks.