docs (operators): add documentation for ignoreElements

src/operator-docs/filtering/ignoreElements.ts

@@ -1,6 +1,67 @@
 import { OperatorDoc } from '../operator.model';
 
 export const ignoreElements: OperatorDoc = {
-  'name': 'ignoreElements',
-  'operatorType': 'filtering'
+  name: 'ignoreElements',
+  operatorType: 'filtering',
+  signature: 'public ignoreElements(): OperatorFunction<any, never>',
+  marbleUrl: 'http://reactivex.io/rxjs/img/ignoreElements.png',
+  shortDescription: {
+    description: `Ignores all items emitted by the source Observable and only passes calls of
+      <span class="markdown-code">complete</span> or <span class="markdown-code">error</span>`
+  },
+  walkthrough: {
+    description: `<p>
+      <span class="markdown-code">ignoreElements</span>
+      Returns an empty Observable that only calls 'complete' or 'error', based on which one is called by source Observable
+    </p>`
+  },
+  examples: [
+    {
+      name: 'Ignores all elements from source',
+      code: `
+      import { interval } from 'rxjs/observable/interval';
+      import { take, ignoreElements } from 'rxjs/operators';
+      //emit value every 100ms
+      const source = interval(100);
+      //ignore everything but complete
+      const example = source.pipe(take(5), ignoreElements());
+      //output: "COMPLETE!"
+      const subscribe = example.subscribe(
+        val => console.log('NEXT:',val),
+        val => console.log('ERROR:',val),
+        () => console.log('COMPLETE!')
+      );
+     `,
+      externalLink: {
+        platform: 'JSBin',
+        url: 'http://jsbin.com/yiyefelubi/1/edit?js,console'
+      }
+    },
+    {
+      name: 'Displaying Error',
+      code: `
+      //emit value every 100ms
+      const source = Rx.Observable.interval(100);
+      //ignore everything but error
+      const error = source
+        .mergeMap(val => {
+          if(val === 4){
+            return Rx.Observable.throw('ERROR AT'val);
+          }
+          return Rx.Observable.of(val);
+        })
+        .ignoreElements();
+      //output: "ERROR: ERROR AT 4"
+      const subscribe = error.subscribe(
+        val => console.log('NEXT:',val),
+        val => console.log('ERROR:',val),
+        () => console.log('SECOND COMPLETE!')
+      );
+     `,
+      externalLink: {
+        platform: 'JSBin',
+        url: 'http://jsbin.com/puwenenata/edit?html,js,console'
+      }
+    }
+  ]
 };