Update Language-Definition.md

Author: antonmedv

docs/Language-Definition.md

@@ -33,45 +33,37 @@
   </tr>
 </table>
 
-## Supported Literals
+## Literals
 
-The package supports:
+* `true`
+* `false`
+* `nil`
 
-* **strings** - single and double quotes (e.g. `"hello"`, `'hello'`)
-* **numbers** - e.g. `103`, `2.5`, `.5`
-* **arrays** - e.g. `[1, 2, 3]`
-* **maps** - e.g. `{foo: "bar"}`
-* **booleans** - `true` and `false`
-* **nil** - `nil`
+### Strings
 
-## Digit separators
+Single or double quotes. Unicode sequences (`\uXXXX`) are supported.
 
-Integer literals may contain digit separators to allow digit grouping into more
-legible forms.
+### Numbers
 
-Example:
+Integers and floats.
 
-```js
-10_000_000_000
-```
+* `42`
+* `3.14`
+* `1e6`
+* `0x2A`
+* `1_000_000`
 
-## Fields
+### Arrays
 
-Struct fields and map elements can be accessed by using the `.` or the `[]`
-syntax.
+* `[1, 2, 3]`
 
-```js
-foo.Field
-bar["some-key"]
-```
+Tailing commas are allowed.
 
-## Functions
+### Maps
 
-Functions may be called using the `()` syntax.
+* `{foo: "bar"}`
 
-```js
-foo.Method()
-```
+Tailing commas are allowed.
 
 ## Operators
 
@@ -86,7 +78,7 @@ foo.Method()
 
 Example:
 
-```js
+```
 x^2 + y^2
 ``` 
 
@@ -107,7 +99,7 @@ x^2 + y^2
 
 Example:
 
-```js
+```
 life < universe || life < everything
 ```
 
@@ -121,23 +113,27 @@ life < universe || life < everything
 
 Example:
 
-```js
+```
 "hello" matches "h.*"
 ```
 
 ### Membership Operators
 
+* `.` (dot)
 * `in` (contain)
 * `not in` (does not contain)
 
+Struct fields and map elements can be accessed by using the `.` or the `[]`
+syntax.
+
 Example:
 
-```js
+```
 user.Group in ["human_resources", "marketing"]
 ```
 
-```js
-"foo" in {foo: 1, bar: 2}
+```
+data["tag-name"] in {foo: 1, bar: 2}
 ```
 
 ### Range Operator
@@ -146,13 +142,13 @@ user.Group in ["human_resources", "marketing"]
 
 Example:
 
-```js
+```
 user.Age in 18..45
 ```
 
 The range is inclusive:
 
-```js
+```
 1..3 == [1, 2, 3]
 ```
 
@@ -166,7 +162,7 @@ Example:
 
 Variable `array` is `[1,2,3,4,5]`.
 
-```js
+```
 array[1:4] == [2,3,4]
 array[:3] == [1,2,3]
 array[3:] == [4,5]
@@ -179,7 +175,7 @@ array[:] == array
 
 Example:
 
-```js
+```
 user.Age > 30 ? "mature" : "immature"
 ```
 
@@ -190,7 +186,7 @@ user.Age > 30 ? "mature" : "immature"
 Returns **true** if all elements satisfies the [predicate](#predicate).
 If the array is empty, returns **true**.
 
-```js
+```
 all(Tweets, {.Size < 280})
 ```
 
@@ -199,13 +195,12 @@ all(Tweets, {.Size < 280})
 Returns **true** if any elements satisfies the [predicate](#predicate).
 If the array is empty, returns **false**.
 
-
 ### `one(array, predicate)`
 
 Returns **true** if _exactly one_ element satisfies the [predicate](#predicate).
 If the array is empty, returns **false**.
 
-```js
+```
 one(Participants, {.Winner})
 ```
 
@@ -232,22 +227,22 @@ Returns new array by filtering elements of the array by [predicate](#predicate).
 Returns the number of elements what satisfies the [predicate](#predicate).
 Equivalent to:
 
-```js
+```
 len(filter(array, predicate))
 ```
 
 ## Predicate
 
-The predicate is an expression that accepts a single argument. To access 
+The predicate is an expression that accepts a single argument. To access
 the argument use the `#` symbol.
 
-```js
+```
 map(0..9, {# / 2})
 ```
 
-If items of the array is a struct or a map, it is possible to access fields with 
+If items of the array is a struct or a map, it is possible to access fields with
 omitted `#` symbol (`#.Value` becomes `.Value`).
 
-```js
+```
 filter(Tweets, {len(.Value) > 280})
 ```