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Javascript strings
This document describes various string methods in JavaScript including charAt(), charCodeAt(), concat(), fromCharCode(), indexOf(), lastIndexOf(), match(), replace(), search(), slice(), split(), substr(), substring(), toLowerCase(), toUpperCase(), trim(), valueOf(), anchor(), big(), and more formatting methods. It provides examples of each method, demonstrating how to call the method and what it returns.
Javascript strings
- 1.
- 2. charAt() var str= "HELLO WORLD"; var res = str.charAt(0); // H
- 3. charCodeAt() var str= "HELLO WORLD"; var n = str.charCodeAt(0); /72
- 4. concat() var str1= "Hello "; var str2 = "world!"; var res = str1.concat(str2); // Hello world
- 5. fromCharCode() var res= String.fromCharCode(65); // A
- 6. indexOf() var str= "Hello world, welcome to the universe."; var n = str.indexOf("welcome"); // 13
- 7. lastIndexOf() var str= "Hello planet earth, you are a great planet."; var n = str.lastIndexOf("planet"); // 36
- 8. match() var str= "The rain in SPAIN stays mainly in the plain"; var res0 = str.match(/ain/g); //global var res1 = str.match(/ain/gi); //global ignore case // ain,ain,ain // ain,AIN,ain,ain
- 9. replace var str= "Visit Microsoft!"; var res = str.replace("Microsoft", “Apple"); // Visit Apple
- 10. Search() var str= "Visit Apple!"; var n = str.search(“Apple"); // 6
- 11. slice() var str= "Hello world!"; var res = str.slice(1,5); // ello
- 12. split() var str= "How are you doing today?"; var res = str.split(" "); // How,are,you,doing,today? (array)
- 13. substr() var str= "Hello world!"; var res = str.substr(1, 4) //ello // desde el 1º 4 caracteres
- 14. substring() var str= "Hello world!"; var res = str.substring(1, 4); // ell // desde el 1º al 4º caracter sin incluirlo.
- 15. toLowerCase() var str= "Hello World!"; var res = str.toLowerCase(); // hello world
- 16. toUpperCase() var str= "Hello World!"; var res = str.toUpperCase(); // HELLO WORLD
- 17. trim() var str= " Hello World! "; alert(str.trim()); //Hello World
- 18. valueOf var str= “1234"; var res = str.valueOf(); // 1234
- 19. anchor() var txt= "Chapter 10"; txt.anchor("chap10"); // <a name="chap10">Chapter 10</a>
- 20. big() var str= "Hello World!"; var result = str.big(); // Hello World!
- 21. Y más… vartxt = "Hello World!"; document.write("The original string: " + txt); document.write("<p>Big: " + txt.big() + "</p>"); document.write("<p>Small: " + txt.small() + "</p>"); document.write("<p>Bold: " + txt.bold() + "</p>"); document.write("<p>Italic: " + txt.italics() + "</p>"); document.write("<p>Fixed: " + txt.fixed() + "</p>"); document.write("<p>Strike: " + txt.strike() + "</p>"); document.write("<p>Fontcolor: " + txt.fontcolor("green") + "</p>"); document.write("<p>Fontsize: " + txt.fontsize(6) + "</p>"); document.write("<p>Subscript: " + txt.sub() + "</p>"); document.write("<p>Superscript: " + txt.sup() + "</p>"); document.write("<p>Link: " + txt.link("http://www.itmaster.com.ar") + "</p>");