1 files changed, 57 insertions, 0 deletions
diff --git a/test/example/application/counter.gleam b/test/example/application/counter.gleam
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+++ b/test/example/application/counter.gleam
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+// IMPORTS ---------------------------------------------------------------------
+
+import gleam/int
+import lustre
+import lustre/attribute.{ style }
+import lustre/element.{ button, div, p, text }
+import lustre/event.{ dispatch, on_click }
+
+// MAIN ------------------------------------------------------------------------
+
+pub fn main () -> Nil {
+    let selector = "[data-lustre-container]"
+    let program  = lustre.application(init(), update, render)
+
+    // `lustre.start` can return an `Error` if no DOM element is found that matches
+    // the selector. This is a fatal error for our examples, so we panic if that 
+    // happens.
+    assert Ok(_) = lustre.start(program, selector)
+
+    Nil
+}
+
+// STATE -----------------------------------------------------------------------
+
+pub type State 
+    = Int
+
+pub fn init () -> State {
+    0
+}
+
+// UPDATE ----------------------------------------------------------------------
+
+pub type Action {
+    Incr
+    Decr
+}
+
+pub fn update (state, action) {
+    case action {
+        Incr ->
+            state + 1
+
+        Decr ->
+            state - 1
+    }
+}
+
+// RENDER ----------------------------------------------------------------------
+
+pub fn render (state) {
+    div([ style([ #("display", "flex") ]) ], [
+        button([ on_click(dispatch(Decr)) ], [ text("-") ]),
+        p([], [ int.to_string(state) |> text ]),
+        button([ on_click(dispatch(Incr)) ], [ text("+") ])
+    ])
+}