docs(operators): add documentation for partition

Author: hardikpthv

src/operator-docs/transformation/partition.ts

@@ -1,6 +1,69 @@
 import { OperatorDoc } from '../operator.model';
 
 export const partition: OperatorDoc = {
-  'name': 'partition',
-  'operatorType': 'transformation'
+  name: 'partition',
+  operatorType: 'transformation',
+  signature:
+    'public partition(predicate: function(value: T, index: number): boolean, thisArg: any): [Observable<T>, Observable<T>',
+  marbleUrl: 'http://reactivex.io/rxjs/img/partition.png',
+  parameters: [
+    {
+      name: 'predicate',
+      type: 'function(value: T, index: number): boolean',
+      attribute: '',
+      description: `A function that evaluates each value emitted by the source Observable. If it returns 'true', the value is emitted on the
+      first Observable in the returned array, if 'false' the value is emitted on the second Observable in the array. The 'index' parameter
+      is the number 'i' for the i-th source emission that has happened since the subscription, starting from the number '0'.`
+    },
+    {
+      name: 'thisArg',
+      type: 'any',
+      attribute: 'optional',
+      description: `An optional argument to determine the value of 'this' in the predicate function.`
+    }
+  ],
+  shortDescription: {
+    description: `Splits the source Observable into two, one with values that satisfy a predicate, and another with values
+      that don't satisfy the predicate.`,
+    extras: [
+      {
+        type: 'Tip',
+        text: `
+        It's like <a href="#/operators/filter" class="markdown-code">filter</a>, but returns two Observables: one like the output of
+        <a href="#/operators/filter" class="markdown-code">filter</a>, and the other with values that did not pass the condition.
+        `
+      }
+    ]
+  },
+  walkthrough: {
+    description: `
+      <p>
+        <span class="markdown-code">partition</span> outputs an array with two Observables that partition the values from the source
+        Observable through the given <span class="markdown-code">predicate</span> function. The first Observable in that array emits
+        source values for which the predicate argument returns true. The second Observable emits source values for which the predicate
+        returns false. The first behaves like <a href="#/operators/filter" class="markdown-code">filter</a> and the second behaves like
+        <a href="#/operators/filter" class="markdown-code">filter</a> with the predicate negated.
+      </p>
+    `
+  },
+  examples: [
+    {
+      name:
+        'Partition click events into those on DIV elements and those elsewhere',
+      code: `
+        const clicks = Rx.Observable.fromEvent(document, 'click');
+        const parts = clicks.partition(ev => ev.target.tagName === 'DIV');
+        const clicksOnDivs = parts[0];
+        const clicksElsewhere = parts[1];
+        clicksOnDivs.subscribe(x => console.log('DIV clicked: ', x));
+        clicksElsewhere.subscribe(x => console.log('Other clicked: ', x));
+      `,
+      externalLink: {
+        platform: 'JSBin',
+        url: 'http://jsbin.com/vekisov/embed?js,console,output'
+      }
+    }
+  ],
+  relatedOperators: ['filter'],
+  additionalResources: []
 };