ZEN expression language

// Numbers
42
3.14
-17
1e6

// Strings
"hello world"
'single quotes work too'
`template with ${variables}`

// Booleans
true
false

// Null
null

// Arrays
[1, 2, 3]
["a", "b", "c"]

// Objects
{ name: "John", age: 30 }
{ [dynamicKey]: value }

condition ? valueIfTrue : valueIfFalse

score >= 70 ? "pass" : "fail"
age >= 18 ? "adult" : age >= 13 ? "teen" : "child"

user.nickname ?? user.name ?? "Anonymous"

// Inclusive range
x in [1..10]      // true if 1 <= x <= 10

// Exclusive range
x in (0..100)     // true if 0 < x < 100

// Mixed
x in [0..100)     // true if 0 <= x < 100
x in (0..100]     // true if 0 < x <= 100

// Negation
x not in [1..10]

// Object properties
customer.name
customer.address.city

// Array indexing
items[0]
items[0].price

// Nested access
order.items[0].product.name

`Hello, ${name}!`
`Total: ${sum(items)} items`
`Status: ${approved ? 'Approved' : 'Pending'}`

string[0:5]      // Characters 0-4 (first 5)
string[7:12]     // Characters 7-11
string[7:]       // From index 7 to end
string[:5]       // First 5 characters (0-4)

> 100         // Greater than 100
< 50          // Less than 50
>= 18         // Greater or equal to 18
<= 65         // Less or equal to 65
== "active"   // Equal to "active"
!= 0          // Not equal to 0

[1..100]      // Between 1 and 100 (inclusive)
(0..100)      // Between 0 and 100 (exclusive)
[18..65)      // 18 to 64
(0..100]      // 1 to 100

'US', 'CA', 'GB'           // Match any of these strings
1, 2, 3, 5, 8              // Match any of these numbers
"pending", "processing"    // Match any of these

> 0 and < 100              // Between 0 and 100
>= 18 and <= 65            // Working age
< 0 or > 100               // Outside 0-100

startsWith($, "PRE-")      // String starts with prefix
contains($, "urgent")      // String contains substring
len($) > 5                 // Length greater than 5

map([1, 2, 3], # * 2)                    // [2, 4, 6]
map(items, #.price * #.quantity)         // [totals...]
filter([1, 2, 3, 4, 5], # > 3)           // [4, 5]
some([1, 2, 3], # > 2)                   // true
all([1, 2, 3], # > 0)                    // true

map(cart.items as item, item.price * item.quantity)
filter(users as user, user.isActive and user.age >= 18)
some(orders as order, order.status == 'pending')

a = 5                        // {"a": 5}
name = 'John'                // {"name": "John"}
items = [1, 2, 3]            // {"items": [1, 2, 3]}
config = {debug: true}       // {"config": {"debug": true}}

user.name = 'Alice'                      // {"user": {"name": "Alice"}}
user.profile.bio = 'Developer'           // {"user": {"profile": {"bio": "Developer"}}}
app.config.database.host = 'localhost'   // Creates full nested structure

a = 1; b = 2                             // {"a": 1, "b": 2}
user.name = 'Charlie'; user.age = 35     // {"user": {"name": "Charlie", "age": 35}}

counter = counter + 1                    // Increment existing value
total = price * quantity                 // Compute from input
fullName = firstName + ' ' + lastName    // String concatenation
doubled = map(numbers, # * 2)            // Array operations
status = score > 70 ? 'pass' : 'fail'    // Conditional

a = 5; b = 10; a + b                     // Returns 15
user.name = 'Eve'; user.name             // Returns "Eve"
config.debug = true; config              // Returns {"debug": true}
config.debug = true; $root               // Returns {"config": {"debug": true}}