Javascript

{
    const str1 = "자바스크립트";
    const str2 = "제이쿼리";

    document.querySelector(".sample01_R1").innerHTML = str1 + str2;

    const num1 = 100;
    const num2 = 200;

    document.querySelector(".sample01_R2").innerHTML = num1 + num2;

    //나는 모던(modern) 자바스크립트(javascript) 핵심을 배우고 싶다.

    const txt1 = "모던";
    const txt2 = "자바스크립트";
    const txt3 = "핵심";

    document.querySelector(".sample01_R3").innerHTML = "나는 " + txt1 + "(modern) " + txt2 + "(javascript) " + txt3 + "을 배우고 싶다.";

    const tem1 = "모던";
    const tem2 = "자바스크립트";
    const tem3 = "핵심";

    document.querySelector(".sample01_R4").innerHTML = `나는 ${tem1}(modern) ${tem2}(javascript) ${tem3}을 배우고 싶다.`;
}

{
    const str1 = "자바스크립트";
    const currentStr1 = str1.length;

    document.querySelector(".sample02_R1").innerHTML = currentStr1;

    const str2 = "javascript";
    const currentStr2 = str2.length;

    document.querySelector(".sample02_R2").innerHTML = currentStr2;
}

{
    const str1 = "javascript";
    const currentStr1 = str1.toUpperCase();

    document.querySelector(".sample03_R1").innerHTML = currentStr1;

    const str2 = "JAVASCRIPT";
    const currentStr2 = str2.toLowerCase();

    document.querySelector(".sample03_R2").innerHTML = currentStr2;
}

{
    const str1 = "      'javascript'        ";
    const currentStr1 = str1.trim();

    document.querySelector(".sample04_R1").innerHTML = currentStr1;
}

{
    const str = "자바스크립트(javascropt) 공부";

    const text1 = str.indexOf("javascropt");
    document.querySelector(".sample05_R1").innerHTML = text1;

    const text2 = str.indexOf("자바스크립트");
    document.querySelector(".sample05_R2").innerHTML = text2;

    const text3 = str.indexOf("제이쿼리");
    document.querySelector(".sample05_R3").innerHTML = text3;

    const text4 = str.indexOf("a");
    document.querySelector(".sample05_R4").innerHTML = text4;

    const text5 = str.lastIndexOf("a");
    document.querySelector(".sample05_R5").innerHTML = text5;

    //indexOf와 다르게 search는 정규식 표현 가능

    const text6 = str.search(/javascropt/);
    document.querySelector(".sample05_R6").innerHTML = text6;

    const text7 = str.search(/jquery/);
    document.querySelector(".sample05_R7").innerHTML = text7;

    const text8 = str.includes("javascropt");
    document.querySelector(".sample05_R8").innerHTML = text8;

    const text9 = str.includes("jquery");
    document.querySelector(".sample05_R9").innerHTML = text9;

    const text10 = str.startsWith("자바스크립트");
    document.querySelector(".sample05_R10").innerHTML = text10;

    const text11 = str.endsWith("javascropt");
    document.querySelector(".sample05_R11").innerHTML = text11;
}

{
    const str = "자바스크립트(javascropt) 공부";

    const text1 = str.charAt(4);
    document.querySelector(".sample06_R1").innerHTML = text1;

    const text2 = str.charAt();
    document.querySelector(".sample06_R2").innerHTML = text2;
}

{
    const str = "자바스크립트(javascropt) 공부";

    const text1 = str.slice(1, 4);

    document.querySelector(".sample07_R1").innerHTML = text1;

    const text2 = str.slice(1);
    document.querySelector(".sample07_R2").innerHTML = text2;

    const text3 = str.slice(3, -1);
    document.querySelector(".sample07_R3").innerHTML = text3;

    //자바스크립트(javascropt) 공부 - javascropt

    const text4 = str.slice(7, 17);
    //const text4 = str.slice(7, -4);
    //const text4 = str.slice(-14, 17);
    //const text4 = str.slice(-14, -4);
    document.querySelector(".sample07_R4").innerHTML = text4;

    const text5 = str.slice(5, 1);
    document.querySelector(".sample07_R5").innerHTML = "";

    const text6 = str.substring(5, 1);
    document.querySelector(".sample07_R6").innerHTML = text6;

    const text7 = str.substr(5, 1);
    document.querySelector(".sample07_R7").innerHTML = text7;
}

{
    const str1 = "자바스크립트(javascropt) 공부";
    const text1 = str1.replace('공부','스터디');
    document.querySelector(".sample08_R1").innerHTML = text1;

    const str2 = "img01.jpg";
    const text2 = str2.replace('img01.jpg','img02.jpg');
    document.querySelector(".sample08_R2").innerHTML = text2;

    const str3 = "010-7579-0168";
    const text3 = str3.replace('-','');
    document.querySelector(".sample08_R3").innerHTML = text3;

    const str4 = "010-7579-0168";
    const text4 = str4.replace(/-/g,'');
    document.querySelector(".sample08_R4").innerHTML = text4;

    const str5 = "010-7579-0168";
    const text5 = str5.replace(/-/g,' ');
    document.querySelector(".sample08_R5").innerHTML = text5;
}

{
    const str = "자바스크립트(javascropt) 공부";

    const text1 = str.split('');
    document.querySelector(".sample09_R1").innerHTML = text1;

    const text2 = str.split(' ');
    document.querySelector(".sample09_R2").innerHTML = text2;

    const text3 = str.split('').join('/');
    document.querySelector(".sample09_R3").innerHTML = text3;

    const str4 = "http://webstorboy.co.kr/main.hetml?id=1234&name=webs"
    const text4 = str4.split('&');
    document.querySelector(".sample09_R4").innerHTML = text4;

    const str5 = "http://webstorboy.co.kr/main.hetml?id=1234&name=webs"
    const text5 = str5.split(/&|\?/);
    document.querySelector(".sample09_R5").innerHTML = text5;
}

{
    const num = "7";
    const text1 = num.padStart(2, '0');
    document.querySelector(".sample10_R1").innerHTML = text1;

    const num2 = "456";
    const text2 = num2.padStart(6, '123');
    document.querySelector(".sample10_R2").innerHTML = text2;

    const num3 = "abc";
    const text3 = num3.padStart(3, '0');
    document.querySelector(".sample10_R3").innerHTML = text3;

    const num4 = "abc";
    const text4 = num4.padStart(6);;
    document.querySelector(".sample10_R4").innerHTML = "<pre>'" + text4 + "'<pre>";

    const num5 = "7";
    const text5 = num5.padEnd(2, '0');
    document.querySelector(".sample10_R5").innerHTML = text5;

    const num6 = "456";
    const text6 = num6.padEnd(6, '123');
    document.querySelector(".sample10_R6").innerHTML = text6;

    const num7 = "abc";
    const text7 = num7.padEnd(3, '0');
    document.querySelector(".sample10_R7").innerHTML = text7;

    const num8 = "abc";
    const text8 = num8.padEnd(6);
    document.querySelector(".sample10_R8").innerHTML = "<pre>'" + text8 + "'<pre>";
}

{
    const text = "https://webstoryboy.co.kr/자바스크립트.html";
    const url = encodeURI(text);
    document.querySelector(".sample11_R1").innerHTML = url;

    const text2 = "https://webstoryboy.co.kr/자바스크립트.html";
    const url2 = encodeURIComponent(text2);
    document.querySelector(".sample11_R2").innerHTML = url2;
    
    const text3 = "https://webstoryboy.co.kr/%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8.html";
    const url3 = decodeURI(text3);
    document.querySelector(".sample11_R3").innerHTML = url3;

    const text4 = "https%3A%2F%2Fwebstoryboy.co.kr%2F%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8.html";
    const url4 = decodeURIComponent(text4);
    document.querySelector(".sample11_R4").innerHTML = url4;
}