Working With Strings In JS

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Working With Strings In JS

JavaScript provides several built-in methods for working with strings. Some of the most commonly used methods are:

.length: Returns the number of characters in a string.
.concat(): Concatenates two or more strings and returns a new string.
.indexOf(): Returns the index of the first occurrence of a specified substring within a string, or -1 if the substring is not found.
.lastIndexOf(): Returns the index of the last occurrence of a specified substring within a string, or -1 if the substring is not found.
.slice(): Returns a new string that is a portion of the original string.
.substring(): Returns a new string that is a portion of the original string.
.substr(): Returns a new string that is a portion of the original string.
.replace(): Replaces a specified substring with a new substring and returns a new string.
.toLowerCase(): Returns a new string with all the characters in lower case.
.toUpperCase(): Returns a new string with all the characters in upper case.
.trim(): Removes whitespace from both ends of a string and returns a new string.
.split(): Splits a string into an array of substrings based on a specified delimiter.
.match(): Returns an array of matches for a specified regular expression.
.search(): Returns the index of the first match for a specified regular expression, or -1 if no match is found.
.charAt(): Returns the character at a specified index in a string.
.charCodeAt(): Returns the Unicode of the character at a specified index in a string.
.fromCharCode(): Returns a string created from the specified sequence of Unicode values.

Code For The Above Methods

Examples:

let str = "Hello World!";
console.log(str.length); // 12
console.log(str.concat(" How are you?")); // "Hello World! How are you?"
console.log(str.indexOf("o")); // 4
console.log(str.slice(0, 5)); // "Hello"
console.log(str.substring(0, 5)); // "Hello"
console.log(str.substr(0, 5)); // "Hello"
console.log(str.replace("World", "JavaScript")); // "Hello JavaScript!"
console.log(str.toLowerCase()); // "hello world!"
console.log(str.toUpperCase()); // "HELLO WORLD!"
console.log(str.trim()); // "Hello World!"
console.log(str.split(" ")); // ["Hello", "World!"]
console.log(str.match(/l/gi)); // ["l", "l"]
console.log(str.search(/l/gi)); // 2
console.log(str.charAt(0)); // "H"
console.log(str.charCodeAt(0)); // 72
console.log(String.fromCharCode(72)); // "H"

These are just some examples of the many methods available for working with strings in JavaScript. You can refer to the official documentation for a more comprehensive list of string methods

Conclusion

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Working With Strings In JS