javascript generators

shama · shama · commit f42c3fd5bf93 · 2016-01-28T09:14:22.000-08:00
diff --git a/javascript-generators/README.md b/javascript-generators/README.md
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+# JavaScript Generators
+
+> [https://youtu.be/Zk_rX2n3Ml8](https://youtu.be/Zk_rX2n3Ml8)
+
+Install [Node.js](https://nodejs.org/).
+
+Then run `node index.js` to run the example.
diff --git a/javascript-generators/big.file b/javascript-generators/big.file
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+This file is really big.
diff --git a/javascript-generators/index.js b/javascript-generators/index.js
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+// function* bears () {
+//   var kind = yield 'grizzly'
+//   yield kind + ' polar'
+//   console.log('kind: ' + kind)
+//   return 'done'
+// }
+// var bear = bears()
+// console.log(bear.next().value)
+// console.log(bear.next('ferocious').value)
+// console.log(bear.next().value)
+
+var fs = require('fs')
+
+run(function* (resume) {
+  var contents = yield fs.readFile('big.file', 'utf8', resume)
+  var uppercase = contents.toUpperCase()
+  yield fs.writeFile('uppercase.file', uppercase, resume)
+  console.log('All done!')
+})
+
+function run (generator) {
+  var data = null, yielded = false
+  var iterator = generator(function () {
+    data = arguments
+    check()
+  })
+  yielded = !!(iterator.next())
+  check()
+  function check () {
+    while (data && yielded) {
+      var err = data[0], item = data[1]
+      data = null
+      yielded = false
+      if (err) return iterator.throw(err)
+      yielded = !!(iterator.next(item))
+    }
+  }
+}
diff --git a/javascript-generators/package.json b/javascript-generators/package.json
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+{
+  "name": "generators-async-await",
+  "version": "0.1.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "author": "Kyle Robinson Young <kyle@dontkry.com> (http://dontkry.com)",
+  "license": "MIT"
+}
diff --git a/javascript-generators/uppercase.file b/javascript-generators/uppercase.file
@@ -0,0 +1 @@
+THIS FILE IS REALLY BIG.
