JavaScript String Reference
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In this article, we will learn JavaScript Strings and their properties and methods with a brief description. JavaScript Strings are used for storing and manipulating text content. It can contain zero or more characters within single or double quotes, like “Geeksforgeeks” or ‘Geeksforgeeks’.
Syntax:
String(object)
Example: In this example, we will return the length of a string.
Javascript
function stringLength() { const str = "GeeksforGeeks"; console.log("String Length: " + str.length);}stringLength(); |
Output:
String Length: 13
Example: In this example, we will return the Date() object’s string value.
Javascript
// Date Object having date and timeconst currentDate = new Date()// date object's string valueconst currentDate_String = currentDate.toString()console.log("Date Object's String Value: " + currentDate_String) |
Output
Date Object's String Value: Wed Sep 06 2023 21:12:54 GMT+0000 (Coordinated Universal Time)
The complete list of JavaScript Strings has listed below:
JavaScript String Constructor: In JavaScript, a constructor gets called when an object is created using the new keyword.
|
Constructor |
Description |
Example |
|---|---|---|
| String() | Convert the value of an object to a string. |
JavaScript String Properties: A JavaScript property is a member of an object that associates a key with a value. There is no static property in the string only instance property.
- Instance Property: An instance property is a property that has a new copy for every new instance of the class.
|
Instance Properties |
Description |
Example |
|---|---|---|
| length | Find out the size of that object | |
| constructor | Return the string constructor function for the object. |
JavaScript String Methods: JavaScript methods are actions that can be performed on objects. There are two types of String methods in JavaScript.
- Static Method: If the method is called using the string class itself then it is called a static method.
|
Static Methods |
Description |
Example |
|---|---|---|
| fromCharCode() | Create a string from the given sequence of UTF-16 code units. | |
| fromCodePoint() | Return a string or an element for the given sequence of code point values (ASCII value). |
- Instance Method: If the method is called on an instance of a string then it is called an instance method.
|
Instance Methods |
Description |
Example |
|---|---|---|
| at() | Find the character at the specified index. | |
| anchor() | Creates an anchor element that is used as a hypertext target. | |
| charAt() | Returns that character at the given index of the string. | |
| charCodeAt() | Returns a Unicode character set code unit of the character present at the index in the string. | |
| codePointAt() | Return a non-negative integer value i.e, the code point value of the specified element. | |
| concat() | Join two or more strings together in JavaScript. | |
| endsWith() | Whether the given string ends with the characters of the specified string or not. | |
| includes() | Returns true if the string contains the characters, otherwise, it returns false. | |
| indexOf() | Finds the index of the first occurrence of the argument string in the given string. | |
| lastIndexOf() | Finds the index of the last occurrence of the argument string in the given string. | |
| localeCompare() | Compare any two elements and returns a positive number | |
| match() | Search a string for a match against any regular expression. | |
| matchAll() | Return all the iterators matching the reference string against a regular expression. | |
| normalize() | Return a Unicode normalization form of a given input string. | |
| padEnd() | Pad a string with another string until it reaches the given length from rightend. | |
| padStart() | Pad a string with another string until it reaches the given length from leftend. | |
| repeat() | Build a new string containing a specified number of copies of the string. | |
| replace() | Replace a part of the given string with some another string or a regular expression | |
| replaceAll() | Returns a new string after replacing all the matches of a string with a specified string/regex. | |
| search() | Search for a match in between regular expressions and a given string object. | |
| slice() | Return a part or slice of the given input string. | |
| split() | Separate given string into substrings using a specified separator provided in the argument. | |
| startsWith() | Check whether the given string starts with the characters of the specified string or not. | |
| substr() | Returns the specified number of characters from the specified index from the given string. | |
| substring() | Return the part of the given string from the start index to the end index. | |
| toLowerCase() | Converts the entire string to lowercase. | |
| toLocaleLowerCase() | Returns the calling string value converted to a lowercase letter. | |
| toLocaleUpperCase() | Returns the calling string value converted to a uppercase letter. | |
| toUpperCase() | Converts the entire string to uppercase. | |
| toString() | Return the given string itself. | |
| trim() | Remove the white spaces from both ends of the given string. | |
| trimEnd() | Remove white space from the end of a string. | |
| trimStart() | Remove white space from the start of a string. | |
| valueOf() | Return the value of the given string. |
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