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Adds example solutions for the observables homework #10

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Adds example solutions for the observables homework #10

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4 changes: 3 additions & 1 deletion observables/exercise-1/observables.js
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Expand Up @@ -7,4 +7,6 @@ const clickStream = Observable.fromEvent(theButton, "click");
Exercise 1:
We've created an Observable stream from the button's click event above.
Subscribe to the stream and print out the emitted value.
*/
*/

clickStream.subscribe(value => console.log('click event: ', value));
4 changes: 3 additions & 1 deletion observables/exercise-2/observables.js
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Expand Up @@ -13,4 +13,6 @@ const clickStream = Observable.fromEvent(theButton, "click");
"Dog #1" after the first click, "Dog #2" after the second, and so on.
*/


clickStream
.map((value, index) => `Dog #${index + 1}`)
.subscribe(dog => console.log(dog));
5 changes: 5 additions & 0 deletions observables/exercise-3/observables.js
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Expand Up @@ -17,3 +17,8 @@ const clickStream = Observable.fromEvent(theButton, "click");
No output after the fourth click,
"Dog #5" after the fith click, and so on.
*/

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@codebyuma codebyuma Mar 26, 2018 •
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Note: in reality, we may want to filter before we map to avoid doing extra work on the emissions we'll eventually ignore. But since the desired output adds the source stream's emission number to the string, we have to filter after we map.

For example, if we filtered first and then mapped, then the output would be Dog #1, Dog #2, etc. If we map and then filter, the output is Dog #1, Dog #3, etc.

If this doesn't make sense, try switching the order and you can see it in action :)

clickStream
.map((value, index) => `Dog #${index + 1}`)
.filter((value, index) => index % 2 === 0)
.subscribe(dog => console.log(dog));
4 changes: 4 additions & 0 deletions observables/exercise-4/observables.js
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Expand Up @@ -19,3 +19,7 @@ const clickStream = Observable.fromEvent(theButton, "click");
If you click the button extra times before each 1000ms is up, we shouldn't see a generated dog.
*/

clickStream
.throttleTime(1000)
.map((value, index) => `Dog #${index + 1}`)
.subscribe(dog => console.log(dog));