1- import { json } from "react-router-dom" ;
2- import { JoinUser , User } from "./utils/data.interface" ;
1+ //intersection types
32
4- // ํจ์
5- function add ( num1 : number , num2 : number ) {
6- // return num1 + num2;
7- console . log ( num1 + num2 ) ;
8- }
3+ import { InterCar , InterToy } from "./utils/data.interface" ;
94
10- function isAdult ( age : number ) : boolean {
11- return age > 19 ;
12- }
13-
14- // '?' : ์ต์
๋ ํ๋ผ๋ฉํฐ - ์ ํ์ ๋งค๊ฐ๋ณ์
15- function hello ( name ?: string ) {
16- return `Hello, ${ name || "world" } ` ;
17- }
18-
19- const result = hello ( ) ;
20- const result2 = hello ( 'sam' ) ;
21-
22- function hello2 ( name = 'world' ) {
23- return `Hello, ${ name } ` ;
24- }
25- // ์ต์
๋ ํ๋ผ๋ฉํฐ ํน์ง - ์ต์
๋ ํ๋ผ๋ฉํฐ๋ ํญ์ ๋ค์ ์์ด์ผํ๋ค. ์ฆ, name ์์ age?๊ฐ ์์ด์๋ ์๋๋ค.
26- function userInfo ( name : string , age ?: number ) : string {
27- if ( age !== undefined ) {
28- return `Hello, ${ name } . You are ${ age } .` ;
29- } else {
30- return `Hello, ${ name } ` ;
31- }
32- }
33-
34- console . log ( userInfo ( "sam" ) ) ;
35- console . log ( userInfo ( "sam" , 30 ) ) ;
36-
37- // ์ต์
๋ ํ๋ผ๋งคํฐ๋ฅผ ์์ ๋๊ณ ์ถ๋ค๋ฉด undefined๋ฅผ ์ ๋์จ ๋ฐฉ์์ผ๋ก ์ฌ์ฉํด์ผ ํ๋ค.
38- function userInfo2 ( age : number | undefined , name : string ) : string {
39- if ( age !== undefined ) {
40- return `Hello, ${ name } . You are ${ age } .` ;
41- } else {
42- return `Hello, ${ name } ` ;
43- }
44- }
45-
46- console . log ( userInfo2 ( 30 , "sam" ) ) ;
47- console . log ( userInfo2 ( undefined , "sam" ) ) ;
48-
49- //๋๋จธ์ง ์ฐ์ฐ ํจ์
50- //spread ๋ฐฉ์์ ๋ฐฐ์ด๋ก ๊ฐ์ด ๋ฆฌํด ๋๊ธฐ ๋๋ฌธ์ ๋ฐฐ์ด ํ์
์ ์ง์ ํด์ผ ํ๋ค.
51- function addSpread ( ...nums : number [ ] ) {
52- return nums . reduce ( ( result , num ) => result + num , 0 ) ;
53- }
54-
55- addSpread ( 1 , 2 , 3 ) ; //6
56- addSpread ( 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ) ; //55
57-
58- //bind ๋ฐฉ์
59-
60- const Sam : User = { name : 'Sam' }
61-
62- function showName ( this : User , age : number , gender : 'm' | 'f' ) { //this: User
63- console . log ( this . name , age , gender ) ;
64- }
65-
66- const a = showName . bind ( Sam ) ;
67- a ( 30 , 'm' ) ;
68-
69- //
70- function join ( name : string , age : number ) : JoinUser ; //overload
71- function join ( name : string , age : string ) : string ; //overload
72-
73- function join ( name : string , age : number | string ) : JoinUser | string {
74- if ( typeof age === "number" ) {
75- //JoinUser ํ์
์ ๋ฆฌํด ๊ฐ
76- return {
77- name,
78- age,
79- } ;
80- } else {
81- //string ํ์
์ ๋ฆฌํด ๊ฐ
82- return "๋์ด๋ ์ซ์๋ก ์
๋ ฅํด์ฃผ์ธ์." ;
83- }
84- }
85- //์ฌ๊ธฐ์ error ๊ฐ ๋์ค๋ ์ด์ ๋ sam์ jane ๋ณ์๋ ํ์ ์ด ์๋ค. JoinUser ๋๋ string์ด ๋ฆฌํด ๊ฐ์ด๊ธฐ ๋๋ฌธ์ด๋ค.
86- // const sam: JoinUser = join("Sam", 30); //error
87- // const jane: string = join("Jane", "30"); //error
88- //์ด๋ด ๋๋ overload๋ฅผ ์ฌ์ฉํด์ผ ํ๋ค.
89-
90- //overload ์ ์ฉ ํ์ ๋์ log๊ฐ
91- const sam : JoinUser = join ( "Sam" , 30 ) ;
92- const jane : string = join ( "Jane" , "30" ) ;
93-
94- //overload ๊ฐ์ผ ๋ถ๋ถ ๋ค์ ๋ค์ด๋ณผ ํ์ ์์.
5+ const toyCar : InterToy & InterCar = {
6+ name : 'ํ์' ,
7+ start ( ) { } ,
8+ color : 'blue' ,
9+ price : 1000 ,
10+ }
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