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nimcache/runnableExamples/asyncjs_examples_1.nim

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+#[
+autogenerated by docgen
+loc: /home/runner/work/Nim/Nim/lib/js/asyncjs.nim(203, 21)
+rdoccmd: -r:off
+]#
+import "/home/runner/work/Nim/Nim/lib/js/asyncjs.nim"
+{.line: ("/home/runner/work/Nim/Nim/lib/js/asyncjs.nim", 203, 21).}:
+  from std/sugar import `=>`
+
+  proc fn(n: int): Future[int] {.async.} =
+    if n >= 7: raise newException(ValueError, "foobar: " & $n)
+    else: result = n * 2
+
+  proc asyncFact(n: int): Future[int] {.async.} =
+    if n > 0: result = n * await asyncFact(n-1)
+    else: result = 1
+
+  proc main() {.async.} =
+    block: # then
+      assert asyncFact(3).await == 3*2
+      assert asyncFact(3).then(asyncFact).await == 6*5*4*3*2
+      let x1 = await fn(3)
+      assert x1 == 3 * 2
+      let x2 = await fn(4)
+        .then((a: int) => a.float)
+        .then((a: float) => $a)
+      assert x2 == "8.0"
+
+    block: # then with `onReject` callback
+      var witness = 1
+      await fn(6).then((a: int) => (witness = 2), (r: Error) => (witness = 3))
+      assert witness == 2
+      await fn(7).then((a: int) => (witness = 2), (r: Error) => (witness = 3))
+      assert witness == 3
+