docs(operator-docs): Added MergeAll operator documentation

src/operator-docs/combination/mergeAll.ts

@@ -1,6 +1,77 @@
-import { OperatorDoc } from '../operator.model';
+import { OperatorDoc } from "../operator.model";
 
 export const mergeAll: OperatorDoc = {
-  'name': 'mergeAll',
-  'operatorType': 'combination'
+  name: "mergeAll",
+  operatorType: "combination",
+  signature: "public mergeAll(concurrent: number): Observable",
+  parameters: [
+    {
+      name: "concurrent",
+      type: "number",
+      attribute: "optional, default: Number.POSITIVE_INFINITY",
+      description: `Maximum number of input Observables being subscribed to concurrently.`
+    }
+  ],
+  marbleUrl: "http://reactivex.io/rxjs/img/mergeAll.png",
+  shortDescription: {
+    description: `Converts a higher-order Observable into a first-order Observable which concurrently
+     delivers all values that are emitted on the inner Observables`,
+    extras: [
+      {
+        type: "Tip",
+        text: "Flattens an Observable-of-Observables."
+      }
+    ]
+  },
+  walkthrough: {
+    description: `
+      <p><code>MergeAll</code> subscribes to an Observable that emits Observables,
+        also known as a higher-order Observable. Each time it observes one of these emitted
+        inner Observables, it subscribes to that and delivers all the values from the inner
+        Observable on the output Observable. The output Observable only completes once all inner
+        Observables have completed. Any error delivered by a inner Observable will be immediately
+        emitted on the output Observable.</p>
+    `
+  },
+  examples: [
+    {
+      name:
+        "Spawn a new interval Observable for each click event, and blend their outputs as one Observable",
+      code: `
+        const clicks = Rx.Observable.fromEvent(document, 'click');
+        const higherOrder = clicks.map((ev) => Rx.Observable.interval(1000));
+        const firstOrder = higherOrder.mergeAll();
+        firstOrder.subscribe(x => console.log(x));
+      `,
+      externalLink: {
+        platform: "JSBin",
+        url: "http://jsbin.com/lebidefocu/1/edit?js,output"
+      }
+    },
+    {
+      name:
+        "Count from 0 to 9 every second for each click, but only allow 2 concurrent timers",
+      code: `
+        const clicks = Rx.Observable.fromEvent(document, 'click');
+        const higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(10));
+        const firstOrder = higherOrder.mergeAll(2);
+        firstOrder.subscribe(x => console.log(x));
+      `,
+      externalLink: {
+        platform: "JSBin",
+        url: "http://jsbin.com/kokezoribu/edit?js,output"
+      }
+    }
+  ],
+  relatedOperators: [
+    "combineAll",
+    "concatAll",
+    "exhaust",
+    "merge",
+    "mergeMap",
+    "mergeMapTo",
+    "mergeScan",
+    "switch",
+    "zipAll"
+  ]
 };