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JavaScript 36

[JavaScript] ํŠน์ • ๋ฌธ์ž ์ „๊นŒ์ง€ ๋ฌธ์ž์—ด ์ž๋ฅด๋Š” ๋ฐฉ๋ฒ• (substring ์ด์šฉ)

Intro ํŠน์ • ๋ฌธ์ž ์ „๊นŒ์ง€ ๋ฌธ์ž์—ด์„ ์ž๋ฅด๋Š” ๋ฐฉ๋ฒ•์— ๋Œ€ํ•ด ์•Œ์•„๋ณด๋„๋ก ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. "message" : "No: 1, 2\nHello World!" ๊ตฌ์ฒด์ ์ธ ์˜ˆ์‹œ๋ฅผ ๋“ค์–ด๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค. ๋‹ค์Œ์˜ ๋ฐ์ดํ„ฐ๊ฐ€ ์žˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•ด๋ด…์‹œ๋‹ค. ๊ธฐ์กด์—๋Š” message์— ํ•ด๋‹นํ•˜๋Š” value (string) ๊ฐ’์„ ํ™”๋ฉด์— ๊ทธ๋Œ€๋กœ ํ‘œ์ถœํ•˜์˜€์Šต๋‹ˆ๋‹ค.ํ•˜์ง€๋งŒ ์œ„ ๋ฌธ์ž์—ด์—์„œ \n ์„ ๊ธฐ์ค€์œผ๋กœ ํ•˜์—ฌ ๋‹จ์ˆœํ•˜๊ฒŒ No: 1, 2 ๋งŒ ํ‘œ์‹œ๋ฅผ ํ•ด์•ผ ํ•œ๋‹ค๋ฉด ์–ด๋–ค ๋ฐฉ๋ฒ•์„ ์‚ฌ์šฉํ•ด์•ผ ํ• ๊นŒ์š”? How to solve the problem javascript์˜ ๋‚ด์žฅ ํ•จ์ˆ˜์ธ substring() ์™€ indexOf()๋ฅผ ํ™œ์šฉํ•˜๋ฉด ๋ฉ๋‹ˆ๋‹ค. indexOf()๋กœ index 8์„ ๋ฐ˜ํ™˜ํ•˜๋ฏ€๋กœ ์ตœ์ข…์ ์œผ๋กœ substring(0, 8) ์ด ๋ฉ๋‹ˆ๋‹ค. ํ•ด๋‹น ๋ฌธ์ž์—ด์—์„œ ์ธ๋ฑ์Šค 0๋ถ€ํ„ฐ 8์ „๊นŒ์ง€..

[JavaScript] JSON.parse() ๋ž€ ๋ฌด์—‡์ธ๊ฐ€?

Intro JavaScript ์˜ JSON.parse() ํ•จ์ˆ˜์— ๋Œ€ํ•ด ์•Œ์•„๋ณด๋„๋ก ํ•ฉ์‹œ๋‹ค. JSON.parse() JSON.parse() ๋ฉ”์„œ๋“œ๋Š” JSON ๋ฌธ์ž์—ด์˜ ๊ตฌ๋ฌธ์„ ๋ถ„์„ํ•˜๊ณ , ๊ทธ ๊ฒฐ๊ณผ์—์„œ JavaScript ๊ฐ’์ด๋‚˜ ๊ฐ์ฒด๋ฅผ ์ƒ์„ฑํ•ฉ๋‹ˆ๋‹ค. ์„ ํƒ์ ์œผ๋กœ, reviver ํ•จ์ˆ˜๋ฅผ ์ธ์ˆ˜๋กœ ์ „๋‹ฌํ•  ๊ฒฝ์šฐ, ๊ฒฐ๊ณผ๋ฅผ ๋ฐ˜ํ™˜ํ•˜๊ธฐ ์ „์— ๋ณ€ํ˜•ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. Syntax JSON.parse(text[, reviver]) Parmaters text : JSON์œผ๋กœ ๋ณ€ํ™˜ํ•  ๋ฌธ์ž์—ด reviver (optional) : ํ•จ์ˆ˜๋ผ๋ฉด, ๋ณ€ํ™˜ ๊ฒฐ๊ณผ๋ฅผ ๋ฐ˜ํ™˜ํ•˜๊ธฐ ์ „์— ์ด ์ธ์ˆ˜์— ์ „๋‹ฌํ•ด ๋ณ€ํ˜•ํ•จ. return value : ์ฃผ์–ด์ง„ JSON ๋ฌธ์ž์—ด์— ๋Œ€์‘ํ•˜๋Š” Object expectiln : ๋ณ€ํ™˜ํ•  ๋ฌธ์ž์—ด์ด ์œ ํšจํ•œ JSON์ด ์•„๋‹ ๊ฒฝ์šฐ Syntax..

[React ์™„๋ฒฝ ๊ฐ€์ด๋“œ] section 3 : ๋ฆฌ์•กํŠธ ๊ธฐ์ดˆ ๋ฐ ์‹ค์Šต ์ปดํฌ๋„ŒํŠธ

์ด ๊ธ€์€ udemy์˜ React ์™„๋ฒฝ ๊ฐ€์ด๋“œ with Redux, Next.js, TypeScript ๊ฐ•์ขŒ๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ ์ •๋ฆฌํ•œ ๋‚ด์šฉ์ž…๋‹ˆ๋‹ค. 24. Module Content React Core Syntax & JSX Working with Components Working with Data 25. ์ปดํฌ๋„ŒํŠธ๋ž€ ๋ฌด์—‡์ธ๊ฐ€? ์™œ ๋ฆฌ์•กํŠธ๋Š” ์ปดํฌ๋„ŒํŠธ์˜ ์ „๋ถ€๋ผ๊ณ  ํ•˜๋Š”๊ฐ€? you will be able to focus on your core business logic that makes up your application instead of having to focus on the actual steps of updating the page when something happens somewhere. React is a..

[JavaScript] JSON.stringify() ์ด๋ž€?

Intro JSON.stringify() ์— ๋Œ€ํ•ด ์•Œ์•„๋ณด๋„๋ก ํ•ฉ์‹œ๋‹ค. Json Jon(JavaScript Object Notation)์€ ๋ฐ์ดํ„ฐ๋ฅผ ๊ฐ์ฒด๋กœ ํ‘œํ˜„ํ•˜๋Š” ํ˜•์‹์œผ๋กœ JavaScript์˜ ๊ฐ์ฒด ํ˜•์‹์„ ๋ชจ๋ฐฉํ•ฉ๋‹ˆ๋‹ค. ์ฒ˜์Œ์—๋Š” JS ์ „์šฉ์œผ๋กœ ๋งŒ๋“ค์–ด์กŒ์ง€๋งŒ, ํ˜„์žฌ๋Š” Java, Python, Go, C# ๊ณผ ๊ฐ™์€ ๋‹ค๋ฅธ ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์–ธ์–ด์—์„œ๋„ Json ํ˜•์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ํด๋ผ์ด์–ธํŠธ-์„œ๋ฒ„ ๊ฐ„ ๋ฐ์ดํ„ฐ๋ฅผ ๊ณต์œ ํ•˜๋Š”๋ฐ ์‚ฌ์šฉ๋˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. JSON.stringify() JSON.stringify() ๋ฉ”์„œ๋“œ๋Š” JavaScript ๊ฐ’์ด๋‚˜ ๊ฐ์ฒด๋ฅผ JSON ๋ฌธ์ž์—ด๋กœ ๋ณ€ํ™˜ํ•ฉ๋‹ˆ๋‹ค. ์„ ํƒ์ ์œผ๋กœ, replacer๋ฅผ ํ•จ์ˆ˜๋กœ ์ „๋‹ฌํ•  ๊ฒฝ์šฐ ๋ณ€ํ™˜ ์ „ ๊ฐ’์„ ๋ณ€ํ˜•ํ•  ์ˆ˜ ์žˆ๊ณ , ๋ฐฐ์—ด๋กœ ์ „๋‹ฌํ•  ๊ฒฝ์šฐ ์ง€์ •ํ•œ ์†์„ฑ๋งŒ ๊ฒฐ๊ณผ์— ํฌํ•จํ•ฉ๋‹ˆ๋‹ค. console.log(..

[JavaScript] ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์˜ ์—ญ์‚ฌ์™€ ํ˜„์žฌ ๊ทธ๋ฆฌ๊ณ  ๋ฏธ๋ž˜ (JavaScript, ECMAScript, JQuery, Babel, Node.js)

์ด ๊ธ€์€ ๋“œ๋ฆผ์ฝ”๋”ฉ๋‹˜์˜ '์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์˜ ์—ญ์‚ฌ์™€ ํ˜„์žฌ ๊ทธ๋ฆฌ๊ณ  ๋ฏธ๋ž˜ (JavaScript, ECMAScript, JQuery, Babel, Node.js)' ๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ ์ •๋ฆฌํ•œ ๋‚ด์šฉ์ž…๋‹ˆ๋‹ค. History 1993๋…„ UI ์š”์†Œ๊ฐ€ ๊ฐ€๋ฏธ๋œ ์ฒซ๋ฒˆ์งธ ์›น ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ํƒ„์ƒํ•˜๊ฒŒ ๋จ Mosaic Web Browser 1994 Netscape Navigator ํƒ„์ƒ Mosaic Web Browser ๋ฅผ ์ด๋Œ๋˜ Mac Andressen์€ Netscape์„ ์„ค๋ฆฝํ•จ Netscape Navigator - Wikipedia ์ดˆ๊ธฐ ์ธํ„ฐ๋„ท ์‚ฌ์šฉ์ž๋“ค์˜ ํญ๋ฐœ์  ๋ฐ˜์‘์„ ์–ป์–ด ์•ฝ 90%์˜ ์‹œ์žฅ์ ์œ ์œจ์„ ์ฐจ์ง€ํ–ˆ๋‹ค. ์ •์  ์‚ฌ์ดํŠธ ์–ด๋–ป๊ฒŒ ํ•˜๋ฉด ๋™์ ์ธ ์›น์‚ฌ์ดํŠธ๋ฅผ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋Š”์ง€ ๊ณ ์‹ฌ → scripting ์–ธ์–ด๋ฅผ ์ถ”๊ฐ€ํ•ด๋ณด์ž! Java → ๋„ˆ๋ฌด ๋ฌด๊ฑฐ์›Œ! Sc..

[JavaScript] prompt() ํ•จ์ˆ˜ ์‚ฌ์šฉ ๋ฐฉ๋ฒ•

Intro JavaScript์˜ prompt() ํ•จ์ˆ˜ ์‚ฌ์šฉ ๋ฐฉ๋ฒ•์— ๋Œ€ํ•ด ์•Œ์•„๋ณด๋„๋ก ํ•ฉ์‹œ๋‹ค. Window.prompt() prompt()๋Š” ์‚ฌ์šฉ์ž๊ฐ€ ํ…์ŠคํŠธ๋ฅผ ์ž…๋ ฅํ•  ์ˆ˜ ์žˆ๋„๋ก ์•ˆ๋‚ดํ•˜๋Š” ์„ ํƒ์  ๋ฉ”์„ธ์ง€๋ฅผ ๊ฐ–๊ณ  ์žˆ๋Š” ๋Œ€ํ™” ์ƒ์ž๋ฅผ ๋„์›๋‹ˆ๋‹ค. Syntax prompt() prompt(message) prompt(message, defaultValue) Parameters message (Optional) : ์‚ฌ์šฉ์ž์—๊ฒŒ ๋ณด์—ฌ์ค„ ๋ฌธ์ž์—ด์„ ๋‚˜ํƒ€๋‚ธ๋‹ค. defaultValue (Optional) : ํ…์ŠคํŠธ ์ž…๋ ฅ ํ•„๋“œ์— ๊ธฐ๋ณธ์œผ๋กœ ์ฑ„์›Œ๋„ฃ์„ ๋ฌธ์ž์—ด์„ ๋œปํ•œ๋‹ค. return value : ์‚ฌ์šฉ์ž๊ฐ€ ์ž…๋ ฅํ•œ ๋ฌธ์ž์—ด, ๋˜๋Š” null Example let sign = prompt("๋‹น์‹ ์˜ ๋ณ„์ž๋ฆฌ๋Š” ๋ฌด์—‡์ž…๋‹ˆ๊นŒ?"); if (sign.toLo..

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