Array of Dates

Good beginner question 👍 — this one actually teaches a very important JavaScript concept.

❌ What’s going wrong?

You are pushing the SAME Date object referenceinto the array again and again.

👉 Date is an object, not a value type.
So when you do this:

 MyDates.push(MyDate); 

you’re not saving a new date — you’re saving a reference to the same object.
Later, when MyDate changes, all array entries point to that updated date, so they look identical.

Think of it like this 🧠
📌 You’re putting the same diaryinto the cupboard 4 times — not 4 different diaries.

🔍 Your code flow (simplified)

1. Create one Date object → MyDate

2. Modify it in each loop ( setDate )

3. Push same objectinto array each time

4. Result → array shows same final date everywhere ❌

✅ Correct way: push a COPY of the Date

You must create a new Date instancefor each entry.

✔️ Fix #1 (Recommended)

 function Test_DateArray(){
  let MyDate = new Date();
  let MyDates = [];

  for (let i = 1; i < 5; i++) {
    MyDate.setDate(MyDate.getDate() + 1);
    MyDates.push(new Date(MyDate)); // ✅ clone date
  }

  Logger.log(MyDates);
} 

✔️ Fix #2 (Cleaner approach)

Avoid mutating the same date at all:

 function Test_DateArray(){
  let MyDates = [];

  for (let i = 1; i < 5; i++) {
    let d = new Date();
    d.setDate(d.getDate() + i);
    MyDates.push(d);
  }

  Logger.log(MyDates);
} 

🧠 Key Concept (Very Important)

So always remember:

Push objects by cloning, not reusing🔁