vault backup: 2022-07-29 11:00:53

content/notes/06-async-javascript.md

@@ -0,0 +1,33 @@
+---
+title: "06-async-javascript"
+aliases: 
+tags: 
+- lecture
+- cosc203
+---
+
+Async programming allows you to start a potentially long running task have still be able to interact while it it running
+
+general process
+- start the task
+- return immediately so other tasks can run
+- notify us with result when the task is finished
+
+
+promises
+- an object returned by an async function
+- represents the current state of the operation
+- when the promise is returned to the caller it not always finished
+- the promise object has methods to handle the eventual success or failure of the operation
+
+```
+const fetchPromise = fetch('https://url.url.json')
+
+fetchPromise
+	.then((reponse) => {
+		return response.json();
+	})
+	.then((data) => {
+		console.log(data[0].name)
+	})
+```

content/notes/cosc-203.md

@@ -36,6 +36,7 @@ tags:
 - [02-basic-css](notes/02-basic-css.md)
 - [03-more-css](notes/03-more-css.md)
 - [05-javascript](notes/05-javascript.md)
+- 
 
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