*JavaScript String Methods you should know:* *1. length* Returns the length of the string. let str = "hello"; str.length; // 5 *2. charAt(index)* Returns the character at the specified index. let str = "hello"; str.charAt(1); // "e" *3. includes(substring)* Checks if the string contains the specified substring. Returns true or false. let str = "hello world"; str.includes("world"); // true *4. indexOf(substring)* Returns the index of the first occurrence of the substring, or -1 if not found. let str = "hello world"; str.indexOf("o"); // 4 *5. lastIndexOf(substring)* Returns the index of the last occurrence of the substring, or -1 if not found. let str = "hello world"; str.lastIndexOf("o"); // 7 *6. slice(start, end)* Extracts a section of the string and returns it as a new string. let str = "hello world"; str.slice(0, 5); // "hello" *7. substring(start, end)* Similar to slice, but doesn’t accept negative indices. let str = "hello world"; str.substring(0, 5); // "hello" *8. toUpperCase()* Converts the string to uppercase. let str = "hello"; str.toUpperCase(); // "HELLO" *9. toLowerCase()* Converts the string to lowercase. let str = "HELLO"; str.toLowerCase(); // "hello" *10. trim()* Removes whitespace from both ends of a string. let str = " hello "; str.trim(); // "hello" *11. split(separator)* Splits the string into an array of substrings using the separator. let str = "a,b,c"; str.split(","); // ["a", "b", "c"] *12. replace(searchValue, newValue)* Replaces the first match of searchValue with newValue. let str = "hello world"; str.replace("world", "there"); // "hello there" *13. startsWith(substring)* Checks if the string starts with the specified substring. let str = "hello world"; str.startsWith("hello"); // true *14. endsWith(substring)* Checks if the string ends with the specified substring. let str = "hello world"; str.endsWith("world"); // true *15. repeat(count)* Repeats the string count times. let str = "ha"; str.repeat(3); // "hahaha" *React ❤️ for more*