add missing return statement (#38128)

* add missing return statement

if abort has already been signaled, this function should not continue making a request or setting up an event listener

* Fix another

---------

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

files/en-us/learn_web_development/extensions/async_js/implementing_a_promise-based_api/index.md

@@ -78,6 +78,7 @@ function alarm(person, delay) {
   return new Promise((resolve, reject) => {
     if (delay < 0) {
       reject(new Error("Alarm delay must not be negative"));
+      return;
     }
     setTimeout(() => {
       resolve(`Wake up, ${person}!`);
@@ -132,6 +133,7 @@ function alarm(person, delay) {
   return new Promise((resolve, reject) => {
     if (delay < 0) {
       reject(new Error("Alarm delay must not be negative"));
+      return;
     }
     setTimeout(() => {
       resolve(`Wake up, ${person}!`);
@@ -190,6 +192,7 @@ function alarm(person, delay) {
   return new Promise((resolve, reject) => {
     if (delay < 0) {
       reject(new Error("Alarm delay must not be negative"));
+      return;
     }
     setTimeout(() => {
       resolve(`Wake up, ${person}!`);

files/en-us/web/api/abortsignal/index.md

@@ -183,6 +183,7 @@ function myCoolPromiseAPI(/* …, */ { signal }) {
     // If the signal is already aborted, immediately throw in order to reject the promise.
     if (signal.aborted) {
       reject(signal.reason);
+      return;
     }
 
     // Perform the main purpose of the API