@@ -175,7 +175,7 @@ function Cup({ guest }) {
175175}
176176
177177export default function TeaGathering () {
178- let cups = [];
178+ const cups = [];
179179 for (let i = 1 ; i <= 12 ; i++ ) {
180180 cups .push (< Cup key= {i} guest= {i} / > );
181181 }
@@ -245,7 +245,7 @@ React では、**副作用は通常、[イベントハンドラ](/learn/respondi
245245
246246``` js src/Clock.js active
247247export default function Clock ({ time }) {
248- let hours = time .getHours ();
248+ const hours = time .getHours ();
249249 if (hours >= 0 && hours <= 6 ) {
250250 document .getElementById (' time' ).className = ' night' ;
251251 } else {
@@ -307,7 +307,7 @@ body > * {
307307
308308``` js src/Clock.js active
309309export default function Clock ({ time }) {
310- let hours = time .getHours ();
310+ const hours = time .getHours ();
311311 let className;
312312 if (hours >= 0 && hours <= 6 ) {
313313 className = ' night' ;
@@ -606,14 +606,14 @@ export default function StoryTray({ stories }) {
606606import { useState , useEffect } from ' react' ;
607607import StoryTray from ' ./StoryTray.js' ;
608608
609- let initialStories = [
609+ const initialStories = [
610610 {id: 0 , label: " Ankit's Story" },
611611 {id: 1 , label: " Taylor's Story" },
612612];
613613
614614export default function App () {
615- let [stories, setStories] = useState ([... initialStories])
616- let time = useTime ();
615+ const [stories , setStories ] = useState ([... initialStories])
616+ const time = useTime ();
617617
618618 // HACK: Prevent the memory from growing forever while you read docs.
619619 // We're breaking our own rules here.
@@ -702,14 +702,14 @@ export default function StoryTray({ stories }) {
702702import { useState , useEffect } from ' react' ;
703703import StoryTray from ' ./StoryTray.js' ;
704704
705- let initialStories = [
705+ const initialStories = [
706706 {id: 0 , label: " Ankit's Story" },
707707 {id: 1 , label: " Taylor's Story" },
708708];
709709
710710export default function App () {
711- let [stories, setStories] = useState ([... initialStories])
712- let time = useTime ();
711+ const [stories , setStories ] = useState ([... initialStories])
712+ const time = useTime ();
713713
714714 // HACK: Prevent the memory from growing forever while you read docs.
715715 // We're breaking our own rules here.
770770``` js src/StoryTray.js active
771771export default function StoryTray ({ stories }) {
772772 // Copy the array!
773- let storiesToDisplay = stories .slice ();
773+ const storiesToDisplay = stories .slice ();
774774
775775 // Does not affect the original array:
776776 storiesToDisplay .push ({
@@ -794,14 +794,14 @@ export default function StoryTray({ stories }) {
794794import { useState , useEffect } from ' react' ;
795795import StoryTray from ' ./StoryTray.js' ;
796796
797- let initialStories = [
797+ const initialStories = [
798798 {id: 0 , label: " Ankit's Story" },
799799 {id: 1 , label: " Taylor's Story" },
800800];
801801
802802export default function App () {
803- let [stories, setStories] = useState ([... initialStories])
804- let time = useTime ();
803+ const [stories , setStories ] = useState ([... initialStories])
804+ const time = useTime ();
805805
806806 // HACK: Prevent the memory from growing forever while you read docs.
807807 // We're breaking our own rules here.
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