1 files changed, 24 insertions, 0 deletions
diff --git a/examples/02-fibonacci/index.ts b/examples/02-fibonacci/index.ts
new file mode 100644
index 0000000..3617495
--- /dev/null
+++ b/examples/02-fibonacci/index.ts
@@ -0,0 +1,24 @@
+import CancellationToken from 'cancellationtoken'
+
+const {cancel, token} = CancellationToken.create()
+fibonacci((n, fib) => {
+  console.log(`F(${n}) = ${fib}`)
+  if (n >= 9) cancel()
+}, token)
+
+// keep  passing n and F(n) to the callback until the token is cancelled
+function fibonacci(cb: (n: number, fib: number) => void, token: CancellationToken): void {
+  let n: number = 0
+  let fib: number = 1
+  let next: number = 1
+
+  setTimeout(generateNext, 0)
+
+  function generateNext() {
+    if (token.isCancelled) return
+    cb(n, fib)
+    ;[fib, next] = [next, fib + next]
+    ++n
+    setTimeout(generateNext, 0)
+  }
+}