webdirections initial

presentations/webdirections-code-2014/.jshintrc

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+{
+    "predef": [ ]
+  , "bitwise": false
+  , "camelcase": false
+  , "curly": false
+  , "eqeqeq": false
+  , "forin": false
+  , "immed": false
+  , "latedef": false
+  , "noarg": true
+  , "noempty": true
+  , "nonew": true
+  , "plusplus": false
+  , "quotmark": true
+  , "regexp": false
+  , "undef": true
+  , "unused": true
+  , "strict": false
+  , "trailing": true
+  , "maxlen": 120
+  , "asi": true
+  , "boss": true
+  , "debug": true
+  , "eqnull": true
+  , "esnext": true
+  , "evil": true
+  , "expr": true
+  , "funcscope": false
+  , "globalstrict": false
+  , "iterator": false
+  , "lastsemic": true
+  , "laxbreak": true
+  , "laxcomma": true
+  , "loopfunc": true
+  , "multistr": false
+  , "onecase": false
+  , "proto": false
+  , "regexdash": false
+  , "scripturl": true
+  , "smarttabs": false
+  , "shadow": false
+  , "sub": true
+  , "supernew": false
+  , "validthis": true
+  , "browser": true
+  , "couch": false
+  , "devel": false
+  , "dojo": false
+  , "mootools": false
+  , "node": true
+  , "nonstandard": true
+  , "prototypejs": false
+  , "rhino": false
+  , "worker": true
+  , "wsh": false
+  , "nomen": false
+  , "onevar": true
+  , "passfail": false
+}

presentations/webdirections-code-2014/gen.js

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+// some asynchronous function, could be anything conforming to the normal node callpath pattern
+
+function timer (callback) {
+  setTimeout(function () {
+    callback(null, new Date())
+  }, 1000)
+}
+
+// Linear congruential pseudo random number generator
+function* random (seed) {
+  while (true) {
+  var m = 25, a = 11, c = 17, z = seed;
+    z = (a * z + c) % m;
+    yield z;
+  }
+}
+
+function* random (seed) {
+  var m = 25, a = 11, c = 17, z = seed;
+  while (true) {
+    z = (a * z + c) % m;
+    seed = yield z;
+    if (typeof seed == 'number')
+      z = seed
+  }
+}
+
+console.log('gen')
+var gen = random(Date.now())
+for (var i = 0; i < 10; i++)
+  console.log(gen.next().value)
+console.log()
+
+var s = Date.now()
+var gen = random(s)
+console.log(gen.next().value)
+console.log(gen.next().value)
+console.log(gen.next().value)
+console.log(gen.next().value)
+console.log(gen.next().value)
+console.log(gen.next().value)
+console.log('seed', s)
+console.log(gen.next(s).value)
+console.log(gen.next().value)
+console.log(gen.next().value)
+console.log(gen.next().value)
+console.log(gen.next().value)
+
+// generator that yields async functions as a way of performing work
+
+function* gengen () {
+  var v1 = yield timer
+  console.log('v1', v1)
+  var v2 = yield timer
+  console.log('v2', v2)
+  var v3 = yield timer
+  console.log('v3', v3)
+  return 'all done'
+}
+
+// a pre-ES6 version of the generator confirming to the general protocol
+
+function fakegen () {
+  var c = 0
+  return {
+    next: function (arg) {
+      c++
+      switch (c) {
+        case 1:
+          return { value: timer };
+        case 2:
+          console.log('v1', arg)
+          return { value: timer };
+        case 3:
+          console.log('v2', arg)
+          return { value: timer };
+        case 4:
+          console.log('v2', arg)
+          return { done: true, value: 'all done' };
+      }
+    }
+  }
+}
+
+// generator async runner, simplistic form of 'co'
+
+function run (fn) {
+  var gen = fn();
+  (function next (arg) {
+    var it = gen.next(arg)
+    console.log('got', it, 'passed', arg)
+    if (it.done)
+      return console.log('done', it.value)
+
+    it.value(function (err, data) {
+      next(data);
+    })
+  }())
+}
+
+// execute the generator function (uncomment one)
+
+//run(fakegen)
+run(gengen);
+