☕ Shops Admin Walkthrough ​

This example shows how to model a multi-shop admin panel in .me using:

• indexed collections (shops[1], shops[2])
• broadcast formulas ([i])
• range selectors ([1..2])
• logical filters ([menu.breakfast_deal > 6])

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Full Script (tests/ShopsExample.ts) ​

import ME from "this.me";
const me = new ME() as any;

console.log("\\n.me example2: shops + [] selectors");

// 1) Build two shops as an indexed collection
me.shops[1].name("Downtown");
me.shops[1].menu.latte.price(4.5);
me.shops[1].menu.espresso.price(3.0);

me.shops[2].name("Riverside");
me.shops[2].menu.latte.price(5.0);
me.shops[2].menu.espresso.price(3.5);

// 2) Broadcast combo logic to every shop (iterator [i])
me.shops["[i]"].menu["="]("breakfast_deal", "latte.price + espresso.price - 1.5");

// 3) Read by range selector
const rangeDeals = me("shops[1..2].menu.breakfast_deal");
console.log("shops[1..2].menu.breakfast_deal ->", rangeDeals);

// 4) Filter shops by computed value
const filteredNames = me("shops[menu.breakfast_deal > 6].name");
console.log("shops[menu.breakfast_deal > 6].name ->", filteredNames);

// 5) Direct leaf checks
console.log("shops[1].menu.breakfast_deal ->", me("shops[1].menu.breakfast_deal")); // 6
console.log("shops[2].menu.breakfast_deal ->", me("shops[2].menu.breakfast_deal")); // 7

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𓂀 Step-by-Step Semantics ​

1) Build the collection ​

me.shops[1].menu.latte.price(4.5);
me.shops[2].menu.latte.price(5.0);

You are creating a semantic indexed tree:

shops
 ├─ 1
 │   └─ menu
 │      ├─ latte.price = 4.5
 │      └─ espresso.price = 3.0
 └─ 2
     └─ menu
        ├─ latte.price = 5.0
        └─ espresso.price = 3.5

2) Broadcast formula over all members ([i]) ​

me.shops["[i]"].menu["="]("breakfast_deal", "latte.price + espresso.price - 1.5");

The kernel compiles one derivation rule and applies it to each existing child under shops.

Result:

• shops[1].menu.breakfast_deal = 6
• shops[2].menu.breakfast_deal = 7

3) Read range slice ([1..2]) ​

me("shops[1..2].menu.breakfast_deal");

Range selector returns a keyed projection:

{ "1": 6, "2": 7 }

4) Filter with logic ​

me("shops[menu.breakfast_deal > 6].name");

Only matching children survive the predicate:

{ "2": "Riverside" }

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𓆣 Optional Audit (Explain) ​

You can inspect why one computed value exists:

console.log(me.explain("shops.2.menu.breakfast_deal"));

This returns:

• expression used
• input dependencies
• last compute metadata
• masked origin if a dependency is stealth

---

Runtime Output (real) ​

suign@Suis-MacBook-Air npm % node tests/ShopsExample.ts

.me example2: shops + [] selectors
shops[1..2].menu.breakfast_deal -> { '1': 6, '2': 7 }
shops[menu.breakfast_deal > 6].name -> { '2': 'Riverside' }
shops[1].menu.breakfast_deal -> 6
shops[2].menu.breakfast_deal -> 7

---

Run ​

node tests/ShopsExample.ts

If the output matches, your collection selectors, broadcast derivation, and logic filter are all working correctly.