JavaScript - String Methods

JavaScript From Beginner To Advanced

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JavaScript provides a couple of methods for working with strings, enabling developers to perform manipulations, searches, transformations, and much more. Below is a comprehensive table of string methods available in JavaScript:

JavaScript String Properties

Here's a table for the commonly used string property:

Sr.No	Property	Description
1	`length`	Returns the length of the string.

JavaScript String Methods

Here's an expanded table of string methods including the additional ones as per the tutorial:

Sr.No	Method Name	Description
1	`charAt()`	Returns the character at the specified index (position).
2	`charCodeAt()`	Returns the Unicode of the character at the specified index.
3	`concat()`	Joins two or more strings, and returns a new joined strings.
4	`fromCharCode()`	Converts Unicode values to characters.
5	`includes()`	Determines whether a string contains a specified string/characters.
6	`endsWith()`	Determines whether a string ends with specified string/characters.
7	`indexOf()`	Returns the position of the first found occurrence of a specified value in a string.
8	`lastIndexOf()`	Returns the position of the last found occurrence of a specified value in a string.
9	`localeCompare()`	Compares two strings in the current locale.
10	`match()`	Searches a string for a match against a regular expression, and returns the matches.
11	`repeat()`	Returns a new string with a specified number of copies of an existing string.
12	`replace()`	Searches a string for a specified value, or a regular expression, and returns a string where the specified values are replaced.
13	`search()`	Searches a string for a specified value, or regular expression, and returns the position of the match.
14	`slice()`	Extracts a part of a string and returns a new string.
15	`split()`	Splits a string into an array of substrings.
16	`startsWith()`	Determines whether a string begins with specified characters.
17	`substr()`	Extracts the characters from a string, beginning at a specified start position, and through the specified number of character.
18	`substring()`	Extracts the characters from a string, between two specified indices.
19	`toLocaleLowerCase()`	Converts a string to lowercase letters, according to the host's current locale.
20	`toLocaleUpperCase()`	Converts a string to uppercase letters, according to the host's current locale.
21	`toLowerCase()`	Converts a string to lowercase letters.
22	`toUpperCase()`	Converts a string to uppercase letters.
23	`toString()`	Returns the value of a String object.
24	`trim()`	Removes whitespace from both ends of a string.
25	`valueOf()`	Returns the primitive value of a String object.
26	`trimStart()`	Removes whitespace from the beginning of a string.
27	`trimEnd()`	Removes whitespace from the end of a string.

Examples

Example 1: Using the length Property

The length property returns the number of characters in a string, including spaces and special characters.

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message.length evaluates to 13 because the string "Hello, World!" consists of 13 characters, including punctuation and spaces.

Example 2: Using the slice() Method

The slice() method extracts a section of a string and returns it as a new string, without modifying the original string. It takes two arguments: the starting index and the ending index (the end index is not included in the result).

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text.slice(0, 5) extracts characters from index 0 to index 5 (not including the character at index 5), resulting in the substring "Hello".
The original string, text, remains unchanged after the operation.

Example 3: Using the toUpperCase() Method

The toUpperCase() method converts the entire string to uppercase letters. It does not take any arguments and does not modify the original string.

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greeting.toUpperCase() converts "Hello, world!" to uppercase, resulting in "HELLO, WORLD!".
This method is often used for normalization or when comparing strings in a case-insensitive manner.

Each of these examples demonstrates practical uses of JavaScript string methods and properties, showcasing how they can be applied to manipulate and analyze text data effectively.

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