google spread sheet 

    


 




















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js 스트링에서 요소 갯수 세기

이상하다 https://stackoverflow.com/questions/881085/count-the-number-of-occurrences-of-a-character-in-a-string-in-javascript If you're looking for the commas: (mainStr. split ( "," ). length - 1 ) //3 If you're looking for the str (mainStr. split ( "str" ). length - 1 ) //4   console . log (( "str1,str2,str3,str4" . match ( /,/g ) || []). length ); //logs 3 console . log (( "str1,str2,str3,str4" . match ( new RegExp ( "str" , "g" )) || []). length ); //logs 4
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STUDY

@GetMapping("/proxy-download") public ResponseEntity<Resource> proxyDownload() {     String sourceUrl = "https://example.com/file-to-download.bin";     ResponseEntity<byte[]> response = restTemplate.exchange(         sourceUrl,         HttpMethod.GET,         null,         byte[].class     );     byte[] fileBytes = response.getBody();     // 👉 원본 Content-Disposition 헤더에서 파일 이름 추출     String disposition = response.getHeaders().getFirst(HttpHeaders.CONTENT_DISPOSITION);     String filename = "default.bin"; // fallback     if (disposition != null && disposition.contains("filename=")) {         // Content-Disposition: attachment; filename="some_file.bin"         filename = disposition.split("filename=")[1].replace("\"", "").trim();     }     HttpHeaders ...
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javascript cheatsheet

JavaScript 기능들을 정리한 치트시트를 제공합니다. 이 치트시트는 데이터 구조와 알고리즘을 구현하는 데 필요한 기본적인 구문과 기능을 포함하고 있습니다. ## JavaScript Coding Cheat Sheet ### 1. **기본 문법** #### 변수 선언 ```javascript let variable = value;   // 변수 선언 (변경 가능) const constant = value; // 상수 선언 (변경 불가) ``` #### 함수 선언 ```javascript // 함수 선언식 function functionName(params) {   // 함수 내용 } // 함수 표현식 const functionName = function(params) {   // 함수 내용 }; // 화살표 함수 const functionName = (params) => {   // 함수 내용 }; ``` ### 2. **기본 데이터 구조** #### 배열 (Array) ```javascript let arr = [1, 2, 3]; // 배열 길이 console.log(arr.length); // 배열 요소 접근 console.log(arr[0]); // 배열의 끝에 추가 arr.push(4); // 배열의 끝에서 제거 arr.pop(); // 배열의 앞에 추가 arr.unshift(0); // 배열의 앞에서 제거 arr.shift(); ``` #### 객체 (Object) ```javascript let obj = {   key1: 'value1',   key2: 'value2' }; // 속성 접근 console.log(obj.key1); // 속성 추가 또는 변경 obj.key3 = 'value3'; // 속성 제거 delete obj.key2; ``` ### 3. **반복문 및 조건문** #### 반복문 ```javascript // for 반복문 for (let i = 0; i ...
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