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feat: add example scripts for argparse, bytes, dataset, html, markdown, uuid, wdantic, and web chat modules Add comprehensive demo scripts showcasing the usage of multiple Wren modules including argument parsing, byte manipulation, in-memory dataset operations, HTML encoding/slugification, markdown-to-HTML conversion, UUID generation/validation, schema validation with wdantic, and a full web chat application with REST endpoints.
2026-01-24 23:40:22 +01:00
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feat: add async/await keywords, Num/String extensions, and Jinja markdown example Add `async` and `await` token support to the Wren compiler with scheduler resolution logic, extend `Num` with `e` constant, hyperbolic trig, base conversion, and new methods (`isZero`, `gcd`, `lcm`, `digits`, etc.), extend `String` with `lower`, `upper`, `capitalize`, `title`, and regenerate `wren_core.wren.inc`. Include `Makefile` for multi-platform builds, rewrite `README.md` with updated build instructions, and add `example/await_demo.wren` and `example/jinja_markdown.wren` demonstrating new features.
2026-01-25 04:58:39 +01:00
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feat: add example scripts for argparse, bytes, dataset, html, markdown, uuid, wdantic, and web chat modules Add comprehensive demo scripts showcasing the usage of multiple Wren modules including argument parsing, byte manipulation, in-memory dataset operations, HTML encoding/slugification, markdown-to-HTML conversion, UUID generation/validation, schema validation with wdantic, and a full web chat application with REST endpoints.
2026-01-24 23:40:22 +01:00
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feat: add async/await keywords, Num/String extensions, and Jinja markdown example Add `async` and `await` token support to the Wren compiler with scheduler resolution logic, extend `Num` with `e` constant, hyperbolic trig, base conversion, and new methods (`isZero`, `gcd`, `lcm`, `digits`, etc.), extend `String` with `lower`, `upper`, `capitalize`, `title`, and regenerate `wren_core.wren.inc`. Include `Makefile` for multi-platform builds, rewrite `README.md` with updated build instructions, and add `example/await_demo.wren` and `example/jinja_markdown.wren` demonstrating new features.
2026-01-25 04:58:39 +01:00
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feat: add example scripts for argparse, bytes, dataset, html, markdown, uuid, wdantic, and web chat modules Add comprehensive demo scripts showcasing the usage of multiple Wren modules including argument parsing, byte manipulation, in-memory dataset operations, HTML encoding/slugification, markdown-to-HTML conversion, UUID generation/validation, schema validation with wdantic, and a full web chat application with REST endpoints.
2026-01-24 23:40:22 +01:00
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<h1>Working with JSON</h1>
<h2>Parse JSON String</h2>
<pre><code>import "json" for Json
var jsonStr = '{"name": "Alice", "age": 30}'
var data = Json.parse(jsonStr)
System.print(data["name"]) // Alice
System.print(data["age"]) // 30</code></pre>
<h2>Parse JSON Array</h2>
<pre><code>import "json" for Json
var jsonStr = '[1, 2, 3, "four", true, null]'
var items = Json.parse(jsonStr)
for (item in items) {
System.print(item)
}</code></pre>
<h2>Access Nested Objects</h2>
<pre><code>import "json" for Json
var jsonStr = '{"user": {"name": "Bob", "address": {"city": "NYC"}}}'
var data = Json.parse(jsonStr)
System.print(data["user"]["name"]) // Bob
System.print(data["user"]["address"]["city"]) // NYC</code></pre>
<h2>Convert Wren Object to JSON</h2>
<pre><code>import "json" for Json
var data = {
"name": "Charlie",
"age": 25,
"active": true
}
var jsonStr = Json.stringify(data)
System.print(jsonStr) // {"name":"Charlie","age":25,"active":true}</code></pre>
<h2>Pretty Print JSON</h2>
<pre><code>import "json" for Json
var data = {
"users": [
{"name": "Alice", "age": 30},
{"name": "Bob", "age": 25}
]
}
var pretty = Json.stringify(data, 2)
System.print(pretty)</code></pre>
<p>Output:</p>
<pre><code>{
"users": [
{
"name": "Alice",
"age": 30
},
{
"name": "Bob",
"age": 25
}
]
}</code></pre>
<h2>Check if Key Exists</h2>
<pre><code>import "json" for Json
var data = Json.parse('{"name": "Alice"}')
if (data.containsKey("name")) {
System.print("Name: %(data["name"])")
}
if (!data.containsKey("age")) {
System.print("Age not specified")
}</code></pre>
<h2>Provide Default Values</h2>
<pre><code>import "json" for Json
var data = Json.parse('{"name": "Alice"}')
var name = data["name"]
var age = data.containsKey("age") ? data["age"] : 0
var city = data.containsKey("city") ? data["city"] : "Unknown"
System.print("%(name), %(age), %(city)")</code></pre>
<h2>Iterate Over Object Keys</h2>
<pre><code>import "json" for Json
var data = Json.parse('{"a": 1, "b": 2, "c": 3}')
for (key in data.keys) {
System.print("%(key): %(data[key])")
}</code></pre>
<h2>Iterate Over Array</h2>
<pre><code>import "json" for Json
var users = Json.parse('[{"name": "Alice"}, {"name": "Bob"}]')
for (i in 0...users.count) {
System.print("%(i + 1). %(users[i]["name"])")
}</code></pre>
<h2>Modify JSON Data</h2>
<pre><code>import "json" for Json
var data = Json.parse('{"name": "Alice", "age": 30}')
data["age"] = 31
data["email"] = "alice@example.com"
data.remove("name")
System.print(Json.stringify(data))</code></pre>
<h2>Parse JSON from File</h2>
<pre><code>import "json" for Json
import "io" for File
var content = File.read("config.json")
var config = Json.parse(content)
System.print(config["setting"])</code></pre>
<h2>Write JSON to File</h2>
<pre><code>import "json" for Json
import "io" for File
var data = {
"database": "myapp.db",
"port": 8080,
"debug": true
}
File.write("config.json", Json.stringify(data, 2))</code></pre>
<h2>Handle Parse Errors</h2>
<pre><code>import "json" for Json
var jsonStr = "invalid json {"
var fiber = Fiber.new { Json.parse(jsonStr) }
var result = fiber.try()
if (fiber.error) {
System.print("Parse error: %(fiber.error)")
} else {
System.print(result)
}</code></pre>
<h2>Work with Null Values</h2>
<pre><code>import "json" for Json
var data = Json.parse('{"name": "Alice", "address": null}')
if (data["address"] == null) {
System.print("No address provided")
}
var output = {"value": null}
System.print(Json.stringify(output)) // {"value":null}</code></pre>
<h2>Build JSON Array Dynamically</h2>
<pre><code>import "json" for Json
var users = []
users.add({"name": "Alice", "role": "admin"})
users.add({"name": "Bob", "role": "user"})
users.add({"name": "Charlie", "role": "user"})
System.print(Json.stringify(users, 2))</code></pre>
<h2>Filter JSON Array</h2>
<pre><code>import "json" for Json
var users = Json.parse('[
{"name": "Alice", "age": 30},
{"name": "Bob", "age": 17},
{"name": "Charlie", "age": 25}
]')
var adults = []
for (user in users) {
if (user["age"] >= 18) {
adults.add(user)
}
}
System.print("Adults: %(Json.stringify(adults))")</code></pre>
<h2>Transform JSON Data</h2>
<pre><code>import "json" for Json
var users = Json.parse('[
{"firstName": "Alice", "lastName": "Smith"},
{"firstName": "Bob", "lastName": "Jones"}
]')
var names = []
for (user in users) {
names.add("%(user["firstName"]) %(user["lastName"])")
}
System.print(names.join(", "))</code></pre>
<h2>Merge JSON Objects</h2>
<pre><code>import "json" for Json
var defaults = {"theme": "light", "language": "en", "timeout": 30}
var userPrefs = {"theme": "dark"}
var config = {}
for (key in defaults.keys) {
config[key] = defaults[key]
}
for (key in userPrefs.keys) {
config[key] = userPrefs[key]
}
System.print(Json.stringify(config, 2))</code></pre>
<div class="admonition tip">
<div class="admonition-title">See Also</div>
<p>For full API documentation, see the <a href="../api/json.html">JSON module reference</a>.</p>
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