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[TS] 1. Basic Types
by JBee
TypeScript์—์„œ๋Š”JavaScript์—์„œ์‚ฌ์šฉํ–ˆ์—ˆ๋˜ย numberย , ย stringย ,
ย booleanย ๊ณผ ๊ฐ™์€๋ฐ์ดํ„ฐํƒ€์ž…์„๊ธฐ๋ฐ˜์œผ๋กœย ์ •์  ํƒ€์ดํ•‘ย ์„์ง€์›ํ•ฉ๋‹ˆ๋‹ค.
Basic Types
๋ณ€์ˆ˜์—ํƒ€์ž…์„์ง€์ •ํ•ด์ฃผ๊ธฐ ์œ„ํ•ด์„œTypeScript์—์„œ๋Š”ย :ย ์„ํ†ตํ•ด์ง€์›ํ•ฉ๋‹ˆ๋‹ค.
๊ธฐ์กด์˜JavaScript์—์„œ๋ณ€์ˆ˜๋ฅผ์„ ์–ธํ•˜๋ฉด์„œย :ย ์œผ๋กœํ•ด๋‹น๋ณ€์ˆ˜์˜ํƒ€์ž…์„์ง€์ •
ํ•ด์ค๋‹ˆ๋‹ค.
Boolean
let isExist: boolean = false;
ย booleanย ํƒ€์ž…์„์ง€์ •ํ•ฉ๋‹ˆ๋‹ค.
Number, ์ˆซ์ž
let decimal: number = 6;
let hex: number = 0xf00d;
let binary: number = 0b1010;
let octal: number = 0o744;
ย numberย ํƒ€์ž…์„์ง€์ •ํ•ฉ๋‹ˆ๋‹ค.
String, ๋ฌธ์ž์—ด
let name: string = "jbee";
let greeting: string = `Hi, I'm ${name}!`;
ย stringย ํƒ€์ž…์„์ง€์ •ํ•ฉ๋‹ˆ๋‹ค.
Array, ๋ฐฐ์—ด
let arr: number[] = [1, 2, 3];
or
let arr: Array<number> = [1, 2, 3];
๊ธฐ์กด์—๋ฐฐ์—ด๋ฆฌํ„ฐ๋Ÿด์„์‚ฌ์šฉํ•˜์—ฌ๋ฐฐ์—ด์„์ •์˜ํ•˜๋ฉด์„œ์ •์˜ํ•˜๋Š”๋ฐฐ์—ด์—์–ด๋– ํ•œ๋ฐ
์ดํ„ฐํƒ€์ž…์˜์›์†Œ๊ฐ€ ๋“ค์–ด๊ฐˆ ๊ฒƒ์ธ์ง€๋ฅผType์„ํ†ตํ•ด์ œ๊ณตํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค. (์ „์ž
์˜ํ˜•ํƒœ๊ฐ€ design guide)
Tuple, ํŠœํ”Œ
ย key-valueย ์˜ํ˜•ํƒœ๋ฅผ์ €์žฅํ• ๋•Œ๋Š”, ์œ„์™€๊ฐ™์ดํƒ€์ž…์„์ง€์ •ํ•ด์ค„์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
TS transpiler๊ฐ€ ์ž˜๋ชป๋œํƒ€์ž…์˜๊ฐ’์ด๋“ค์–ด์™”๋‹ค๋Š”๊ฒƒ์„error message๋กœ์•Œ๋ ค
์ค๋‹ˆ๋‹ค.
let tuple: [string, number];
tuple = ["age", 25];
tuple = ["name", "jbee];// Error
> message: 'Type '[string, string]' is not assignable to type '
Type 'string' is not assignable to type 'number'.' at: '5,1'
Enum
enum Color {Red, Green, Blue};
let c: Color = Color.Green;
๋งˆ์ฐฌ๊ฐ€์ง€๋กœJava์˜ย enumย ๊ณผ ๊ฐ™์€๊ตฌ์กฐ๋ฅผ๊ฐ–์Šต๋‹ˆ๋‹ค. ์‹œ์ž‘ํ•˜๋Š”๋ฉค๋ฒ„์—0๋ถ€ํ„ฐ
๋ฒˆํ˜ธ๋ฅผ๋งค๊ธฐ๊ณ , ๋งŒ์•ฝ1๋ถ€ํ„ฐ์‹œ์ž‘ํ•ด์•ผํ•œ๋‹ค๋ฉด์ž„์˜์ ์œผ๋กœ์‹œ์ž‘ํ•˜๋Š”์ˆซ์ž๋ฅผ์ง€์ •
ํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค. ๋˜๋Š”๊ฐ๊ฐ์—๊ฒŒ ๋ฒˆํ˜ธ๋ฅผ์ง€์ •ํ• ์ˆ˜๋„์žˆ์Šต๋‹ˆ๋‹ค.
enum Subject {Math = 1, Science = 3, History = 7}
console.log(Subject[3]);//Science
์ง€์ •ํ•œ๋ฒˆํ˜ธ๋กœํ˜ธ์ถœ๋„๊ฐ€๋Šฅํ•ฉ๋‹ˆ๋‹ค.
ย tscย ๋ช…๋ น์–ด๋ฅผํ†ตํ•ด์„œ์ €ํฌ๊ฐ€ ์ž‘์„ฑํ•œTypeScript ์ฝ”๋“œ๋ฅผ๋ณ€ํ™˜๋œJavascript
์ฝ”๋“œ๋กœ๋ณผ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค. TypeScript์˜ย Enumย ์€๋‹ค์Œ๊ณผ ๊ฐ™์ด๋ณ€ํ™˜๋˜๋Š”๊ฒƒ์„
ํ™•์ธํ•˜์‹ค์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
var Subject;
(function (Subject) {
Subject[Subject["Math"] = 1] = "Math";
Subject[Subject["Science"] = 3] = "Science";
Subject[Subject["History"] = 7] = "History";
})(Subject || (Subject = {}));
์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์˜๋‹ค์„ฏ์ค„์ดํƒ€์ž…์Šคํฌ๋ฆฝํŠธํ•œ์ค„๋กœ์ž‘์„ฑ๋˜์—ˆ์Šต๋‹ˆ๋‹ค:)
Any
์ฝ”๋“œ๋ฅผ์ž‘์„ฑํ•˜๋ฉด์„œ์‚ฌ์šฉ๋˜๋Š”๋ณ€์ˆ˜์—์•Œ๋งž์€๋ฐ์ดํ„ฐํƒ€์ž…์„์„ค์ •ํ•˜๋Š”๊ฒƒ์€์ค‘์š”
ํ•˜์ง€๋งŒ๋ฐ์ดํ„ฐํƒ€์ž…์ด๋™์ ์œผ๋กœ๊ฒฐ์ •๋˜๋Š”๋ณ€์ˆ˜๋„์กด์žฌํ•˜๊ฒŒ ๋ฉ๋‹ˆ๋‹ค. ์ด๋Ÿด๋•Œ์‚ฌ
์šฉํ• ์ˆ˜์žˆ๋Š”ํƒ€์ž…์ดย anyย ์ž…๋‹ˆ๋‹ค.
let notSureVar: any;
notSureVar = 3;
notSureVar = `hi`;
notSureVar = [1,2,3];
ย anyย ๋กœํƒ€์ž…์„์ง€์ •ํ•˜๋ฉดCompile Time์—์„œย Type checkingย ์„ํ•˜์ง€์•Š
์Šต๋‹ˆ๋‹ค.
let notSureVar; // == let notSureVar: any;
ย anyย ๋กœํƒ€์ž…์„์ง€์ •ํ•˜๋Š”๊ฒƒ๊ณผ ์œ„์˜์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ๋Š”๋™์น˜๋ผ๊ณ  ๋ณผ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
let arr: any[] = [1, `jbee`, true];
์—ฌ๋Ÿฌ๊ฐ€์ง€ํƒ€์ž…์˜์š”์†Œ๊ฐ€ ํฌํ•จ๋˜๋Š”๋ฐฐ์—ด์„์ •์˜ํ• ๋•Œ๋„ย anyย ๋ฅผ์‚ฌ์šฉํ• ์ˆ˜์žˆ
์Šต๋‹ˆ๋‹ค.
ย anyย ์˜์—ญํ• ์ด์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์—์„œ์˜ย Objectย ์™€๊ฐ™์€์—ญํ• ์„ํ•˜๋Š”๋Š๋‚Œ์ด๋“œ
๋Š”๋ฐ์š”, ์‹ค์ œ๋กœ2.2version์—์„œย Objectย ํƒ€์ž…์ด์ถ”๊ฐ€๋˜์—ˆ์Šต๋‹ˆ๋‹ค. ์ผ๋‹จ์ฝ”๋“œ
๋ฅผํ†ตํ•ดํ™•์ธํ•ด๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค.
let user = {
getName() {
console.log(`hi`);
},
name : "jbee"
}
let notSureObj: Object;
notSureObj = user;
notSureObj.getName(); // error
notSureObj.name; // error
//Property 'getName' does not exist on type 'Ojbect'
let notSureVar: any;
notSureVar = user;
notSureVar.getName(); // success
notSureVar.name; // "jbee"
๋ณ€์ˆ˜์˜type์„ย Objectย ๋กœ์ง€์ •ํ•˜๊ณ , ์‹ค์ œObject๋ฅผ์ •์˜ํ•˜์—ฌ๋ณ€์ˆ˜์—ํ• ๋‹นํ–ˆ
์Šต๋‹ˆ๋‹ค. ๊ทธ๋ฆฌ๊ณ  ํ• ๋‹นํ•œOjbect์—์กด์žฌํ•˜๋Š”๋ฉ”์†Œ๋“œ๋ฅผํ˜ธ์ถœํ–ˆ๋”๋‹ˆ์—๋Ÿฌ๊ฐ€ ๋ฐœ์ƒ
ํ•ฉ๋‹ˆ๋‹ค. ย getName()ย ์ด๋ผ๋Š”ํ”„๋กœํผํ‹ฐ๊ฐ€ ์—†๋‹ค๊ณ  ํ•˜๋„ค์š”.
๋ถ„๋ช…ย getName()ย ๋ฉ”์†Œ๋“œ๊ฐ€ ์กด์žฌํ•˜๋Š”Ojbect๋ฅผํ• ๋‹นํ–ˆ๋Š”๋ฐ๋ง์ด์ฃ . ย nameย 
ํ”„๋กœํผํ‹ฐ๋„๋งˆ์ฐฌ๊ฐ€์ง€์ž…๋‹ˆ๋‹ค. ํ•˜์ง€๋งŒย anyย ํƒ€์ž…์œผ๋กœ์ง€์ •ํ–ˆ์„๋•Œ๋Š”๋ฉ”์†Œ๋“œ๋ฅผ
ํ˜ธ์ถœํ• ์ˆ˜์žˆ๊ณ , ํ”„๋กœํผํ‹ฐ๋ฅผ์ฐพ์„์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค. ์ดย Objectย ํƒ€์ž…์€ํ• ๋‹น๋งŒ๊ฐ€
๋Šฅํ• ๋ฟ, ๋ฉ”์†Œ๋“œ๋‚˜ํ”„๋กœํผํ‹ฐ์—์ ‘๊ทผํ• ์ˆ˜์—†์Šต๋‹ˆ๋‹ค.
About Object Type
Void
๊ฐ’์„๋ฐ˜ํ™˜ํ•˜์ง€์•Š๋Š”ํ•จ์ˆ˜์˜return type์„์ง€์ •ํ• ๋•Œ์‚ฌ์šฉํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
function greeting(): void {
console.log(`hi`);
}
๋ฌผ๋ก ๋ณ€์ˆ˜์˜ํƒ€์ž…์—๋„์‚ฌ์šฉํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
let foo: void;
foo = undefined;
foo = null;
foo = `foo`; //error
> Type 'string' is not assignable to type 'void'
ํ•˜์ง€๋งŒย voidย ๋กœ์„ ์–ธ๋œ๋ณ€์ˆ˜์—๋Š”ย undefinedย ์™€ย nullย ๊ฐ’๋งŒํ• ๋‹นํ• ์ˆ˜์žˆ
์Šต๋‹ˆ๋‹ค.
Null, Undefined
๊ธฐ๋ณธ์ ์œผ๋กœย nullย ๊ณผ ย undefinedย ๋Š”๋ชจ๋“ ํƒ€์ž…๋“ค์˜์„œ๋ธŒํƒ€์ž…์ด๋ผ๊ณ  ํ• ์ˆ˜์žˆ
์Šต๋‹ˆ๋‹ค. ์ฆ‰๋‹ค๋ฅธํƒ€์ž…์œผ๋กœ์ง€์ •๋œ๋ณ€์ˆ˜์—๋„ย nullย ๊ณผ ย undefinedย ๋ฅผํ• ๋‹นํ• 
์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
ย --strictNullChecksย flag๋ฅผ์‚ฌ์šฉํ•˜๊ฒŒ ๋˜๋ฉดย nullย ๊ณผ
ย undefinedย ๋Š”ย voidย ํƒ€์ž…์˜๋ณ€์ˆ˜์—๋งŒํ• ๋‹นํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
TypeScript์—์„œ๋Š”ํ•ด๋‹นflag์‚ฌ์šฉ์„๊ถŒ์žฅํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค.
Never
ย neverย ํƒ€์ž…์€๋ฐœ์ƒํ•˜์ง€์•Š๋Š”๊ฒฝ์šฐ์—๋Œ€ํ•œํƒ€์ž…์„๋Œ€ํ‘œํ•˜๋Š”ํƒ€์ž…์ž…๋‹ˆ๋‹ค. ์ฝ”๋“œ
๋ฅผํ†ตํ•ด์‚ดํŽด๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค.
์œ„์˜์˜ˆ์ œ์™€๊ฐ™์ดย throwย ๋ฅผํ•˜๊ฑฐ๋‚˜error๋ฅผ๋ฐœ์ƒ์‹œํ‚ค๋Š”function์˜return
type์œผ๋กœ์„ค์ •ํ•ฉ๋‹ˆ๋‹ค. About Never Type
// Function returning never must have unreachable end point
function error(message: string): never {
throw new Error(message);
}
// Inferred return type is never
function fail() {
return error("Something failed");
}
// Function returning never must have unreachable end point
function infiniteLoop(): never {
while (true) {
}
}
Type Assertions
ํƒ€์ž…์–ด์„ค์…˜์ด๋ž€๊ฐœ๋ฐœ์ž๊ฐ€ ํƒ€์ž…์Šคํฌ๋ฆฝํŠธ์—๊ฒŒ "๋‚ด๊ฐ€ ๋ฌด์Šจ์ง“์„ํ•˜๊ณ  ์žˆ๋Š”์ง€์•„
๋‹ˆ๊นŒ, ๋‚˜๋ฅผ๋ฏฟ์–ด์ค˜!"ํ•˜๊ณ  ๋ฉ”์„ธ์ง€๋ฅผ๋ณด๋‚ด๋Š”๊ฒƒ์ž…๋‹ˆ๋‹ค. ์ฃผ๋กœ์—”ํ‹ฐํ‹ฐ์˜ํƒ€์ž…์„๋ณด
๋‹ค๊ตฌ์ฒด์ ์œผ๋กœ์„ค์ •ํ• ๋•Œ์‚ฌ์šฉํ•ฉ๋‹ˆ๋‹ค.
let greet: any = `Hello!`;
let lengthOfGreet: number;
lengthOfGreet = greet.length;
lengthOfGreet = (<string> greet).length;
lengthOfGreet = (greet as string).length;
ย anyย ํƒ€์ž…์—๋Œ€ํ•ด์„œย ํ˜•๋ณ€ํ™˜(type casting)ย ํ•˜๋Š”๊ฒƒ์ฒ˜๋Ÿผ๋ณด์ด์ง€๋งŒ์‹ค์ œ๋กœ
๋Š”ํŠน๋ณ„ํ•œ๊ฒ€์‚ฌ๋‚˜๋ฐ์ดํ„ฐ์žฌ๊ตฌ์„ฑ์„ํ•˜์ง€์•Š์Šต๋‹ˆ๋‹ค. ์ดํƒ€์ž…์–ด์„ค์…˜์€์ปดํŒŒ์ผํƒ€
์ž„์—๋งŒ์˜ํ–ฅ์„๋ฏธ์น ๋ฟ๋Ÿฐํƒ€์ž„์‹œ์—๋Š”์•„๋ฌด๋Ÿฐ์˜ํ–ฅ์„์ฃผ์ง€์•Š์Šต๋‹ˆ๋‹ค. ๋ณด๋‹ค๋ฐ์ด
ํ„ฐํƒ€์ž…์„๊ตฌ์ฒดํ™”์‹œํ‚ฌ๋•Œ์‚ฌ์šฉํ•ฉ๋‹ˆ๋‹ค.
ย <>ย ๋ฅผ์‚ฌ์šฉํ•˜๋Š”๋ฐฉ๋ฒ•๊ณผ ย asย ๋ฅผ์‚ฌ์šฉํ•˜๋Š”๋‘๊ฐ€์ง€๋ฐฉ๋ฒ•์ด์กด์žฌํ•ฉ๋‹ˆ๋‹ค. ์„ ํ˜ธ๋„
์—๋”ฐ๋ผ์–ด๋–ป๊ฒŒ ์‚ฌ์šฉํ• ์ง€๊ฒฐ์ •ํ• ์ˆ˜์žˆ์ง€๋งŒย JSXย ์™€ํ•จ๊ป˜์‚ฌ์šฉํ•˜๋Š”๊ฒฝ์šฐ์—๋Š”
ย asย ๋ฅผ์‚ฌ์šฉํ•˜๋Š”๋ฐฉ๋ฒ•๋งŒํ—ˆ์šฉ๋ฉ๋‹ˆ๋‹ค.
๊ฐ์‚ฌํ•ฉ๋‹ˆ๋‹ค:)
1. Basic Type end
Reference
TypeScript Official Document โ€‘ Basic Types

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01. basic types