# @c_s_v_s_subrahmanyam/string-utils

A comprehensive set of string manipulation utilities implemented in JavaScript. This package offers a variety of custom functions for string analysis, transformation, checks, and more.

All string operations are implemented manually without relying on inbuilt functions for educational purposes.

## Installation

You can install the package via npm:

```bash
npm install @c_s_v_s_subrahmanyam/string-utils
```

## Usage
Once installed, you can use the string utilities in your JavaScript code like so:
```
const stringUtils = require('@c_s_v_s_subrahmanyam/string-utils');

// Translate string using a mapping
const mapping = { 'a': '1', 'b': '2', 'c': '3' };
console.log(stringUtils.translate('abc', mapping)); // 123

// Expand tabs with a specified tab size
console.log(stringUtils.expandTabs('Hello\tWorld', 4)); // Hello    World

// Iterate over characters of a string
console.log(stringUtils.iterateCharacters('Hello')); // ['H', 'e', 'l', 'l', 'o']

// Get length of string
console.log(stringUtils.getLength('Hello World')); // 11

// Count words in a string
console.log(stringUtils.countWords('Hello World! This is a test.')); // 6

// Reverse a string
console.log(stringUtils.reverse('abcd')); // dcba

// Convert string to uppercase
console.log(stringUtils.toUpperCase('hello')); // HELLO
```
The remaining functions' sample code is available in the test.js file

## Available Functions

### String Translation
- ```translate(str, mapping)```: Translates characters in the string according to the provided mapping.
### String Expansion and Iteration
- ```expandTabs(str, tabSize)```: Expands tabs in the string with a specified tab size (default 4).
- ```iterateCharacters(str)```: Returns an array of characters in the string.
### Indexing and Slicing
- ```sliceString(str, start, end)```: Slices the string from start to end indices.
- ```getIndex(str, index):``` Returns the character at the specified index in the string.
### String Partitioning
- ```splitAt(str, index)```: Splits the string at the specified index into two parts.
- ```partition(str, delimiter)```: Partitions the string at the first occurrence of the delimiter.
- ```rpartition(str, delimiter)```: Partitions the string at the last occurrence of the delimiter.
### Encoding and Decoding
- ```encodeToBytes(str)```: Encodes the string into a byte array (UTF-8).
- ```decodeFromBytes(bytes)```: Decodes a byte array into a string.
- ```encodeBase64(str)```: Encodes the string to Base64.
- ```decodeBase64(str)```: Decodes a Base64 string back to its original format.
- ```encodeURI(str)```: Encodes the string as a URI.
- ```decodeURI(str```: Decodes a URI-encoded string.
### String Analytics
- ```countCharacters(str)```: Returns the number of characters in the string.
- ```characterFrequency(str)```: Returns the frequency of each character in the string.
- ```startsWith(str, search)```: Checks if the string starts with the specified substring.
- ```endsWith(str, search)```: Checks if the string ends with the specified substring.
- ```substring(str, start, end)```: Returns a substring from start to end indices.
- ```split(str, delimiter)```: Splits the string by the specified delimiter.
- ```join(array, delimiter)```: Joins an array of strings into one string using the specified delimiter.
### Case Folding and Normalization
- ```caseFold(str)```: Converts the string to lowercase.
- ```normalize(str, form)```: Normalizes the string to a specific Unicode form (default: 'NFC').
### String Comparison Utilities
- ```equalsIgnoreCase(str1, str2)```: Compares two strings ignoring case.
- ```compareLexicographically(str1, str2)```: Compares two strings lexicographically.
- ```startsWith(str, prefix)```: Checks if the string starts with the specified prefix.
- ```endsWith(str, suffix)```: Checks if the string ends with the specified suffix.
- ```containsSubstring(str, substring)```: Checks if the string contains the specified substring.
### Prefix and Suffix Utilities
- ```removePrefix(str, prefix)```: Removes the specified prefix from the string.
- ```removeSuffix(str, suffix)```: Removes the specified suffix from the string.
### Regex Utilities
- ```match(str, regex)```: Returns an array of matches found using the regex.
- ```replaceRegex(str, regex, replacement)```: Replaces matched substrings with the replacement string.
- ```testRegex(str, regex)```: Tests if the string matches the given regex pattern.
- ```extractEmails(str)```: Extracts all emails from the string.
- ```extractURLs(str)```: Extracts all URLs from the string.
### String Repetition
- ```repeatString(str, times)```: Repeats the string the specified number of times.
- ```generateCaptcha(length)```: Generates a random captcha string of the specified length (default 6).
### Sorting Utilities
- ```sortCharacters(str, order)```: Sorts the characters in the string in ascending or descending order.
- ```sortWords(str, order)```: Sorts the words in the string in ascending or descending order.
- ```uniqueCharacters(str)```: Returns a string with unique characters from the original string.
### String Transformations
- ```toUpperCase(str)```: Converts the string to uppercase.
- ```toLowerCase(str)```: Converts the string to lowercase.
- ```reverse(str)```: Reverses the string.
- ```concatenate(...args)```: Concatenates multiple strings into one.
- ```replace(str, search, replace)```: Replaces all occurrences of search in the string with replace.
- ```trim(str)```: Trims leading and trailing whitespace from the string.
- ```padStart(str, length, char)```: Pads the start of the string to the specified length with the given character.
- ```padEnd(str, length, char)```: Pads the end of the string to the specified length with the given character.
- ```caseConversion(str, targetCase)```: Converts the string to camelCase, snake_case, or kebab-case.
### Unicode Operations
- ```charAt(str, index)```: Returns the character at the specified index.
- ```charCodeAt(str, index)```: Returns the Unicode value of the character at the specified index.
- ```fromCharCode(...codes)```: Returns a string created from the given Unicode character codes.
- ```toUnicode(str)```: Converts the string to Unicode escape sequences.
- ```fromUnicode(unicodeStr)```: Converts a Unicode escape sequence string to a regular string.
### Validators for Strings
- ```isEmail(str)```: Checks if the string is a valid email address.
- ```isURL(str)```: Checks if the string is a valid URL.
- ```isPalindrome(str)```: Checks if the string is a palindrome (ignoring non-alphanumeric characters).
- ```isAlphanumeric(str)```: Checks if the string contains only alphanumeric characters.
- ```isDigit(str)```: Checks if the string is a valid number.
- ```isSpace(str)```: Checks if the string contains only whitespace characters.
- ```passwordStrength(password)```: Returns the strength of the password ('Weak', 'Medium', 'Strong').
### Unique Words and Word Analysis
- ```findUniqueWords(str)```: Extracts and returns an array of unique words from the input string.
- ```getShortestWord(str)```: Returns the shortest word in the string.
- ```getLongestWord(str)```: Returns the longest word in the string.
### Sentence and Line Counting
- ```countSentences(str)```: Counts the number of sentences in the string.
- ```countLines(str)```: Counts the number of lines in the string.
### Word Filtering
- ```getWordsStartingWithConsonants(str)```: Returns an array of words starting with consonants.
- ```getWordsStartingWithVowels(str)```: Returns an array of words starting with vowels.
### String Comparison and Substrings
- ```isAnagram(str1, str2)```: Checks if two strings are anagrams of each other.
- ```isPangram(str)```: Checks if the string contains all letters of the alphabet.
- ```reverseSubstring(str, substring)```: Reverses the specified substring in the string.
- ```isSubstring(str, substring)```: Checks if the substring exists within the string.
### Random String and Substring Generation
- ```generateRandomSubstring(str, length)```: Generates a random substring of the specified length from the string.
- ```generateRandomString(length)```: Generates a random string of the specified length using alphanumeric characters.
### Password Suggestions
- ```generatePasswordSuggestions(base)```: Generates an array of password suggestions based on the input base string.
### License
This package is open-source and available under the **ISC License**.