docs: replace xxx.filter(...)[0] with xxx.find(...)

see #1801

public/docs/_examples/cb-dependency-injection/ts/app/hero.service.ts

@@ -13,7 +13,7 @@ export class HeroService {
  ];
 
   getHeroById(id: number): Hero {
-    return this.heroes.filter(hero => hero.id === id)[0];
+    return this.heroes.find(hero => hero.id === id);
   }
 
   getAllHeroes(): Array<Hero> {

public/docs/_examples/router-deprecated/ts/app/crisis-center/crisis.service.ts

@@ -21,7 +21,7 @@ export class CrisisService {
 
   getCrisis(id: number | string) {
     return crisesPromise
-      .then(crises => crises.filter(c => c.id === +id)[0]);
+      .then(crises => crises.find(c => c.id === +id));
   }
 
 // #enddocregion

public/docs/_examples/router-deprecated/ts/app/heroes/hero.service.ts

@@ -22,6 +22,6 @@ export class HeroService {
 
   getHero(id: number | string) {
     return heroesPromise
-      .then(heroes => heroes.filter(h => h.id === +id)[0]);
+      .then(heroes => heroes.find(h => h.id === +id));
   }
 }

public/docs/_examples/router/ts/app/crisis-center/crisis.service.ts

@@ -25,7 +25,7 @@ export class CrisisService {
 
   getCrisis(id: number | string) {
     return crisesPromise
-      .then(crises => crises.filter(c => c.id === +id)[0]);
+      .then(crises => crises.find(crisis => crisis.id === +id));
   }
 
 // #enddocregion

public/docs/_examples/router/ts/app/heroes/hero.service.ts

@@ -22,6 +22,6 @@ export class HeroService {
 
   getHero(id: number | string) {
     return heroesPromise
-      .then(heroes => heroes.filter(h => h.id === +id)[0]);
+      .then(heroes => heroes.find(hero => hero.id === +id));
   }
 }

public/docs/_examples/testing/ts/app/hero.service.ts

@@ -20,7 +20,7 @@ export class HeroService {
   // #docregion get-hero
   getHero(id: number) {
     return Promise.resolve(HEROES).then(
-      heroes => heroes.filter(hero => hero.id === id)[0]
+      heroes => heroes.find(hero => hero.id === id)
     );
   }
   // #enddocregion get-hero

public/docs/_examples/toh-5/ts/app/hero.service.ts

@@ -20,7 +20,7 @@ export class HeroService {
   // #docregion get-hero
   getHero(id: number) {
     return this.getHeroes()
-               .then(heroes => heroes.filter(hero => hero.id === id)[0]);
+               .then(heroes => heroes.find(hero => hero.id === id));
   }
   // #enddocregion get-hero
 }

public/docs/_examples/toh-6/ts/app/hero.service.ts

@@ -33,7 +33,7 @@ export class HeroService {
 
   getHero(id: number) {
     return this.getHeroes()
-               .then(heroes => heroes.filter(hero => hero.id === id)[0]);
+               .then(heroes => heroes.find(hero => hero.id === id));
   }
 
   // #docregion save