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[TS] 3. Function in TypeScript
by. Jbee
TypeScript์—์„œํ•จ์ˆ˜๋ฅผ์ •์˜ํ•˜๋Š”๋ฐ์žˆ์–ด์„œ๋ช‡๊ฐ€์ง€์ถ”๊ฐ€๋œ๊ธฐ๋Šฅ์—๋Œ€ํ•ด์‚ดํŽด
๋ด…๋‹ˆ๋‹ค.
Table of Contents
Return type, Parameter type
Default Parameter / Rest Parameter
Optional Parameter
Union Type
Overloading
์ธ์ž์™€๋ฐ˜ํ™˜๊ฐ’์˜ํƒ€์ž…์„์„ค์ •ํ•œ๋‹ค.
ํ•จ์ˆ˜๋˜๋Š”๋ฉ”์†Œ๋“œ๋ฅผ์ •์˜ํ• ๋•Œ, ํƒ€์ž…์„์ •์˜ํ•ด์ค๋‹ˆ๋‹ค.
ES6 code
function getMonthFromString(dateOfStringFormat) {
const monthOfNumberFormat = parseInt(dateOfStringFormat.subst
return monthOfNumberFormat;
}
์œ„ํ•จ์ˆ˜๋Š”'201712'์ด๋ผ๋Š”๋ฌธ์ž์—ด์„๋ฐ›์•„์„œํ•ด๋‹นํ•˜๋Š”์›”์„๋ฐ˜ํ™˜ํ•˜๋Š”ํ•จ์ˆ˜์ž…๋‹ˆ
๋‹ค. (๋ฐ˜ํ™˜๊ฐ’์˜ํ˜•์‹์„๋ช…์‹œํ•˜๊ธฐ ์œ„ํ•ด๋ฐ”๋กœreturnํ•˜์ง€์•Š๊ณ  ๋ณ€์ˆ˜์—์ž„์‹œ๋กœ๋ฐ›์•„
์ค€๋’ค๋ฐ˜ํ™˜ํ•ฉ๋‹ˆ๋‹ค.) ์œ„์™€๊ฐ™์ดString ํƒ€์ž…์˜์ธ์ž๋ฅผ๋ฐ›์•„์•ผํ•œ๋‹ค๋Š”๊ฒƒ์„๋ช…์‹œ
ํ•ด์ค˜์•ผํ•˜๊ธฐ ๋•Œ๋ฌธ์—๋ณ€์ˆ˜๋ช…๋ถ€ํ„ฐ๊ต‰์žฅํžˆ์ด์ƒํ•ด์ง‘๋‹ˆ๋‹ค. ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์—๋Š”ํƒ€์ž…
์ด๋ผ๋Š”๊ฒƒ์ด์—†๊ธฐ ๋•Œ๋ฌธ์—๋ฉ”์†Œ๋“œ๋ช…๋˜๋Š”๋ณ€์ˆ˜๋ช…์—ํƒ€์ž…์„๋ช…์‹œํ• ์ˆ˜๋ฐ–์—์—†์Šต
๋‹ˆ๋‹ค.
๋งŒ์•ฝNumber ํƒ€์ž…์˜201712๋ฅผ์ธ์ž๋กœ๋„˜๊ฒจ์ค€๋‹ค๋ฉดNumber์—๋Š”substring
์ด๋ผ๋Š”ํ•จ์ˆ˜๊ฐ€ ์—†๊ธฐ ๋•Œ๋ฌธ์—์—๋Ÿฌ๊ฐ€ ๋ฐœ์ƒํ•ฉ๋‹ˆ๋‹ค. ์œ„ํ•จ์ˆ˜๋ฅผ๋ณด๋‹ค์•ˆ์ •์ ์œผ๋กœ์ž‘
์„ฑํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š”๋‹ค์Œ๊ณผ ๊ฐ™์€if ๋ฌธ์ดํ•„์š”ํ•˜๊ฒŒ ๋ฉ๋‹ˆ๋‹ค.
function getMonthFromString(dateOfStringFormat) {
if (typeof dateOfStringFormat !== "string") {
throw Error("Invalid format of parameter");
}
const monthOfNumberFormat = parseInt(dateOfStringFormat.subst
return monthOfNumberFormat;
}
๊ธฐ๋ณธ์ ์œผ๋กœํ•จ์ˆ˜๊ฐ€ ์ˆ˜ํ–‰ํ•ด์•ผํ•˜๋Š”๋น„์ฆˆ๋‹ˆ์Šค๋กœ์ง์™ธ๋ถˆํ•„์š”ํ•œ๋ฐฉ์–ด์ฝ”๋“œ๊ฐ€ ์ฝ”๋“œ
๋ฅผ๋”๋Ÿฝํžˆ๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ์œ„ํ•จ์ˆ˜๋ฅผTypeScript ํ•จ์ˆ˜๋กœ๋ณ€๊ฒฝํ•ด๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค.
const getMonth = (date: string): number => {
return parseInt(date.substring(4, 6), 10);
}
์ธ์ž์™€๋ฐ˜ํ™˜๊ฐ’์—ํƒ€์ž…์„์„ค์ •ํ•˜์—ฌ๋ฉ”์†Œ๋“œ์ด๋ฆ„๊ณผ ๋ณ€์ˆ˜๋ช…์ดํ›จ์”ฌ์งง์•„์กŒ์Šต๋‹ˆ๋‹ค.
๊ทธ๋Ÿผ์—๋„๋ถˆ๊ตฌํ•˜๊ณ  ํ•ด๋‹นํ•จ์ˆ˜๊ฐ€ ํ•˜๋Š”์—ญํ• ์„ES6๋กœ์ž‘์„ฑํ–ˆ์„๋•Œ๋ณด๋‹ค๋ช…ํ™•ํ•ด์กŒ
์œผ๋ฉฐ, ๋ถˆํ•„์š”ํ•œ๋ฐฉ์–ด์ฝ”๋“œ๋งˆ์ €์‚ฌ๋ผ์กŒ์Šต๋‹ˆ๋‹ค.
wtfjs์—์„œํ™•์ธํ•˜์‹ค์ˆ˜์žˆ์ง€๋งŒ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์—์„œ๋Š”ํƒ€์ž…์ด๋ฉ‹๋Œ€๋กœ(์‚ฌ์‹ค์€๋งค
์šฐ๋‹ค์–‘ํ•œ๊ทœ์น™์„๊ธฐ๋ฐ˜์œผ๋กœ) ์บ์ŠคํŒ…๋˜๋Š”๊ฒฝ์šฐ๊ฐ€ ๋งŽ์€๋ฐ์š”, ์ด๋ฅผ๋ฐฉ์ง€ํ•˜๊ธฐ ์œ„ํ•ด
์šฐ๋ฆฌ๋Š”๋ถˆํ•„์š”ํ•œ๋ฐฉ์–ด์ฝ”๋“œ๋ฅผ์ž‘์„ฑํ•ด์™”์Šต๋‹ˆ๋‹ค. ํƒ€์ž…์„์ง€์ •ํ•จ์œผ๋กœ์จ์ด๋Ÿฌํ•œ์ž‘
์—…์„์ตœ์†Œํ™”ํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
Default Parameter, Rest Parameter
ํ•ด๋‹น์ŠคํŽ™์€ES6 ํ‘œ์ค€์ŠคํŽ™์—์„œ๋„์ง€์›ํ•˜๊ณ  ์žˆ๋Š”์ŠคํŽ™์ด๋ฏ€๋กœ๊ตฌ์ฒด์ ์€์„ค๋ช…์€
๋„˜์–ด๊ฐ€๊ฒ ์Šต๋‹ˆ๋‹ค. ์ž์„ธํ•œ๋‚ด์šฉ์€์ฒจ๋ถ€ํ•˜๋Š”ํฌ์ŠคํŒ…์„ํ™•์ธํ•ด์ฃผ์„ธ์š”.
ES6. Rest Parameter
ES6. Default Parameter
TypeScript์—์„œ๋„ํ•ด๋‹น์ŠคํŽ™์„์ง€์›ํ•ฉ๋‹ˆ๋‹ค.
Default parameter TypeScript code
์œ„์ฝ”๋“œ์—์„œ๋Š”์ธ์ž๊ฐ€ ๋„˜๊ฒจ์ง€์ง€์•Š์•˜์„๊ฒฝ์šฐ(ย undefinedย ), ์ง€์ •ํ•ด์ค€๊ฐ’์œผ๋กœ
์ธ์ž๋ฅผ์„ค์ •ํ•ฉ๋‹ˆ๋‹ค. ๋ช…์‹œ์ ์œผ๋กœย nullย ์„์ธ์ž๋กœ๋„˜๊ฒจ์ฃผ๋ฉดdefault๋กœ์„ค์ •๋œ
parameter๋ฅผ๋ฌด์‹œํ•˜๊ณ  ย nullย ์„์ธ์ž๋กœ๋„˜๊น๋‹ˆ๋‹ค. ์ง€์ •ํ•œ์ธ์ž๋ฅผ๋ชจ๋‘๋„˜๊ธฐ
์ง€์•Š์œผ๋ฉด์—๋Ÿฌ๋ฅผ๋ฑ‰๋˜TypeScript๋„default parameter๊ฐ€ ์ง€์ •๋˜์–ด์žˆ์œผ๋ฉด
์—๋Ÿฌ๋ฅผ๋ฐœ์ƒ์‹œํ‚ค์ง€์•Š์Šต๋‹ˆ๋‹ค.
const getRandomNumber = (min: number = 0, max: number = 10
return Math.floor(Math.random() * (max - min)) + min;
}
console.log(getRandomNumber(1)); // OK!
Rest parameter TypeScript code
ย rest parameterย ์˜ํƒ€์ž…์€๋ฐฐ์—ด(array)์ด๋ฏ€๋กœ์ธ์ž์—ํ•ด๋‹นํ•˜๋Š”ํƒ€์ž…์„์„ค
์ •ํ•ด์ค๋‹ˆ๋‹ค.
export const setSkills = (...skills: string[]): void => {
// ...
}
Optional Parameter
TypeScript์—์„œ๋Š”default parameter ์—†์„๊ฒฝ์šฐ, signature์—์„œ์ •์˜ํ•œ๋Œ€
๋กœ์ธ์ž๋ฅผ๋„˜๊ฒจ์ฃผ์ง€์•Š์œผ๋ฉด์—๋Ÿฌ๊ฐ€ ๋ฐœ์ƒํ•ฉ๋‹ˆ๋‹ค. ํ•˜์ง€๋งŒํŒŒ๋ผ๋ฏธํ„ฐ๋ฅผ๋„˜๊ฒจ์ฃผ์ง€
์•Š์•„๋„๋˜๋„๋ก์„ค์ •ํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
ย ?ย ๋ฅผํ†ตํ•ด์„œํ•จ์ˆ˜์—optionalํ•œparameter๋ฅผ์ง€์ •ํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
const setSpec = (major: string, option?: string): void => {
console.log(major);
console.log(option);
}
setSpec("Computer Science");
// console> Computer Science
// console> undefined
Union Type
ํŒŒ๋ผ๋ฏธํ„ฐ์—ํƒ€์ž…์„์ง€์ •ํ• ๋•Œ, ๋‘๊ฐ€์ง€์ด์ƒ์˜ํƒ€์ž…์ด์ง€์ •ํ• ํ•„์š”๊ฐ€ ์žˆ์„์ˆ˜
์žˆ๋Š”๋ฐ์š”, ๊ทธ๋Ÿด๋•ŒUnion type์„ํ†ตํ•ด์„œํŒŒ๋ผ๋ฏธํ„ฐ์˜ํƒ€์ž…์„์ง€์ •ํ•ด์ค„์ˆ˜์žˆ์Šต
๋‹ˆ๋‹ค.
sayName(position: string | boolean | number): void {
if (typeof position === "string") {
console.log(`string type position`);
} else if (typeof position === "boolean") {
console.log(`boolean type position`)
} else {
console.log(`else`);
}
}
์œ„์ฝ”๋“œ์—์„œ๋Š”ย positionย ์ด๋ผ๋Š”ํŒŒ๋ผ๋ฏธํ„ฐ๊ฐ€ ย stringย , ย booleanย ,
ย numberย ์„ธ๊ฐ€์ง€์˜ํƒ€์ž…์ผ์ˆ˜์žˆ๋‹ค๊ณ  signature๋ฅผ์ง€์ •ํ–ˆ์Šต๋‹ˆ๋‹ค. (์˜ˆ์ œ๊ฐ€ ์†ก
๊ตฌ์Šค๋Ÿฝ๋„ค์š”)
Overloading
๋ฐ”๋กœ์ด์ „Class ํฌ์ŠคํŒ…์—์„œ์ž๋ฐ”์™€๊ฐ™์€์˜ค๋ฒ„๋กœ๋”ฉ์„์ง€์›ํ•˜์ง€์•Š๋Š”๋‹ค๊ณ  ํ–ˆ๋Š”
๋ฐ์š”, ย optional parameterย ์™€ย union typeย ๊ทธ๋ฆฌ๊ณ  ย anyย ๋ผ๋Š”ํƒ€์ž…์„
์‚ฌ์šฉํ•˜๋ฉด์ž๋ฐ”์—์„œ๊ตฌํ˜„ํ•˜๋Š”๊ฒƒ๊ณผ๋Š”์กฐ๊ธˆ ๋‹ค๋ฅด์ง€๋งŒ์˜ค๋ฒ„๋กœ๋”ฉ์„๊ตฌํ˜„ํ• ์ˆ˜์žˆ์Šต
๋‹ˆ๋‹ค.
์œ„์™€๊ฐ™์ด๋™์ผํ•œ๋ฉ”์†Œ๋“œ๋ช…์—๋Œ€ํ•ด์—ฌ๋ŸฌSignature๋ฅผ์ •์˜ํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค. ์œ„
์ฝ”๋“œ์—์„œ๋Š”ย sayNameย ์ด๋ผ๋Š”๋ฉ”์†Œ๋“œ์˜Signature๊ฐ€ ์„ธ๊ฐœ์ด๋ฉฐ๋งˆ์ง€๋ง‰๋ฉ”์†Œ
๋“œ์—์„œ๋งŒ์ด๋ฅผ๊ตฌํ˜„ํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ๊ทธ๋ฆฌ๊ณ  ๋ฉ”์†Œ๋“œbody์—์„œ๋Š”parameter์˜
ํƒ€์ž…์œผ๋กœ๋ถ„๊ธฐ๋ฅผํ•˜์—ฌ๋กœ์ง์„์ˆ˜ํ–‰ํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค.
class Person {
//..
sayName(position: string, option?: string): void;
sayName(position: boolean, option: string): void;
sayName(position: string | boolean, option: any): any {
if (typeof position === "string") {
console.log(`string type position`);
} else if (typeof position === "boolean") {
console.log(`boolean type position`)
} else {
console.log(`else`);
}
}
//..
}
const person: Person = new Person();
person.sayName("FrontEnd");
person.sayName("FrontEnd", "optional);
person.sayName(false, "option required");
// person.sayName(true); Error! (1)
// person.sayName(1); Error! (2)
ย sayNameย ์„ํ˜ธ์ถœํ•˜๊ฒŒ ๋˜๋ฉด, ๋ฉ”์†Œ๋“œ๋ฅผํ˜ธ์ถœํ•˜๋Š”์‹œ์ ์—์„œ๊ฐ ์ƒํ™ฉ์—๋งž๋Š”
signature๊ฐ€ ์ ์šฉ๋ฉ๋‹ˆ๋‹ค. ย Error (1)ย ์„๋ณด๋ฉดย booleanย ํƒ€์ž…์ด์ธ์ž๋กœ๋„˜
์–ด๊ฐ”์„๊ฒฝ์šฐ์˜signature์—๋”ฐ๋ผย optionย ์ดย requiredย ์ธ์ž์ด๋ฏ€๋กœ์—๋Ÿฌ๊ฐ€
๋ฐœ์ƒํ•ฉ๋‹ˆ๋‹ค. ย Error (2)ย ๋Š”์–ด๋Аsignature์™€๋„์ผ์น˜ํ•˜์ง€์•Š์œผ๋‹ˆ์—๋Ÿฌ๊ฐ€ ๋ฐœ
์ƒํ•ฉ๋‹ˆ๋‹ค. ์ด๋ ‡๊ฒŒ TypeScript์—์„œ๋Š”์—ฌ๋Ÿฌsignature๋ฅผ์ •์˜ํ•œ๋’ค๋ฉ”์†Œ๋“œ๋‚ด
์—์„œ์ด๋ฅผ๋ถ„๊ธฐํ•˜์—ฌ์˜ค๋ฒ„๋กœ๋”ฉ์„๊ตฌํ˜„ํ• ์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค.
๋งˆ๋ฌด๋ฆฌ
TypeScript ์ข€๋”์•ˆ์ •์„ฑ์žˆ๋Š”, ๊ฐ„๊ฒฐํ•œ, ๊ฐ€๋…์„ฑ์ด์ข‹์€ํ•จ์ˆ˜๋ฅผ์ž‘์„ฑํ• ์ˆ˜์žˆ๊ฒŒ
๋˜์—ˆ์Šต๋‹ˆ๋‹ค. ์–ด๋–ป๊ฒŒ ๋ณด๋ฉดํƒ€์ดํ•‘์ด๊ธธ์–ด์ง€๋Š”๊ฒฐ๊ณผ์ฒ˜๋Ÿผ๋ณด์ผ์ˆ˜์žˆ๊ฒ ์ง€๋งŒํƒ€์ž…
์˜๋ช…์‹œ๊ฐ€ ํ•„์š”ํ•œ๋ถ€๋ถ„์—์žˆ์–ด์„œ๋Š”์˜คํžˆ๋ ค์ฝ”๋“œ๊ฐ€ ๋”์งง์•„์ง€๊ฒŒ ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.
๊ฐ์‚ฌํ•ฉ๋‹ˆ๋‹ค.

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[Swift] Functions
๋ณ€์ˆ˜ ์ด๋ฆ„์˜ ํšจ๊ณผ
06์žฅ ํ•จ์ˆ˜
C์ˆ˜์—…์ž๋ฃŒ
C์ˆ˜์—…์ž๋ฃŒ
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(๋‹ท๋„ท, C#๊ธฐ์ดˆ๊ต์œก)C#์„ ํƒ์ ์ธ์ˆ˜, ๋ช…๋ช…๋œ ์ธ์ˆ˜
แ„‘แ…กแ„‹แ…ตแ„Šแ…ฅแ†ซแ„Œแ…ฅแ†ผแ„…แ…ต 20160130
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ํฌํŠธํด๋ฆฌ์˜ค์—์„œ ์‚ฌ์šฉํ•œ ๋ชจ๋˜ C++
Javascript ์™„๋ฒฝ ๊ฐ€์ด๋“œ ์ •๋ฆฌ
ํ”„๋กœ๊ทธ๋ž˜๋ฐ ๋Œ€ํšŒ: C++11 ์ด์•ผ๊ธฐ
Angular2๋ฅผ ์œ„ํ•œ ํƒ€์ž…์Šคํฌ๋ฆฝํŠธ
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