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docs: rewrite Observable examples with pipable operators #31074

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22 changes: 11 additions & 11 deletions aio/content/guide/comparing-observables.md
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,7 @@ promise.then((value) => {
* Observables differentiate between transformation function such as a map and subscription. Only subscription activates the subscriber function to start computing the values.


<code-example hideCopy>observable.map((v) => 2*v);</code-example>
<code-example hideCopy>observable.pipe(map((v) => 2*v));</code-example>


* Promises do not differentiate between the last `.then` clauses (equivalent to subscription) and intermediate `.then` clauses (equivalent to map).
Expand Down Expand Up @@ -112,7 +112,7 @@ The following code snippets illustrate how the same kind of operation is defined
</tr>
<tr>
<td>Transform</td>
<td><pre>obs.map((value) => value * 2 );</pre></td>
<td><pre>obs.pipe(map((value) => value * 2));</pre></td>
<td><pre>promise.then((value) => value * 2);</pre></td>
</tr>
<tr>
Expand Down Expand Up @@ -227,7 +227,7 @@ An observable produces values over time. An array is created as a static set of
<tr>
<td><pre>concat()</pre></td>
<td>
<pre>obs.concat(obsB)</pre>
<pre>concat(obs, obsB)</pre>

@lacolaco lacolaco Jun 16, 2019

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concat operator is deprecated. Currently, static concat creator function is only recommended.

<pre>➞1➞2➞3➞5➞7➞'a'➞'b'➞'c'</pre>
</td>
<td>
Expand All @@ -238,7 +238,7 @@ An observable produces values over time. An array is created as a static set of
<tr>
<td><pre>filter()</pre></td>
<td>
<pre>obs.filter((v) => v>3)</pre>
<pre>obs.pipe(filter((v) => v>3))</pre>
<pre>➞5➞7</pre>
</td>
<td>
Expand All @@ -249,7 +249,7 @@ An observable produces values over time. An array is created as a static set of
<tr>
<td><pre>find()</pre></td>
<td>
<pre>obs.find((v) => v>3)</pre>
<pre>obs.pipe(find((v) => v>3))</pre>
<pre>➞5</pre>
</td>
<td>
Expand All @@ -260,7 +260,7 @@ An observable produces values over time. An array is created as a static set of
<tr>
<td><pre>findIndex()</pre></td>
<td>
<pre>obs.findIndex((v) => v>3)</pre>
<pre>obs.pipe(findIndex((v) => v>3))</pre>
<pre>➞3</pre>
</td>
<td>
Expand All @@ -271,9 +271,9 @@ An observable produces values over time. An array is created as a static set of
<tr>
<td><pre>forEach()</pre></td>
<td>
<pre>obs.forEach((v) => {
<pre>obs.pipe(tap((v) => {
console.log(v);
})
}))
1
2
3
Expand All @@ -294,7 +294,7 @@ An observable produces values over time. An array is created as a static set of
<tr>
<td><pre>map()</pre></td>
<td>
<pre>obs.map((v) => -v)</pre>
<pre>obs.pipe(map((v) => -v))</pre>
<pre>➞-1➞-2➞-3➞-5➞-7</pre>
</td>
<td>
Expand All @@ -305,8 +305,8 @@ An observable produces values over time. An array is created as a static set of
<tr>
<td><pre>reduce()</pre></td>
<td>
<pre>obs.scan((s,v)=> s+v, 0)</pre>
<pre>➞1➞3➞6➞11➞18</pre>
<pre>obs.pipe(reduce((s,v)=> s+v, 0))</pre>
<pre>➞18</pre>
</td>
<td>
<pre>arr.reduce((s,v) => s+v, 0)</pre>
Expand Down