@devdynamo/string-utils

String Manipulation Utility Functions

This repository contains various JavaScript functions for manipulating strings in creative and useful ways.

Functions Included

1. Title Case a Sentence

Each word in the sentence starts with a capital letter.

function titleCase(sentence) {
    return sentence
        .split(' ')
        .map(word => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase())
        .join(' ');
}

Example:

titleCase("hello world from javascript");
// Output: "Hello World From Javascript"

2. Alternate Case (Weird Caps)

Every alternate character is uppercase.

function alternateCase(str) {
    return str.split('')
        .map((char, index) => index % 2 === 0 ? char.toUpperCase() : char.toLowerCase())
        .join('');
}

Example:

alternateCase("javascript is fun");
// Output: "JaVaScRiPt iS FuN"

3. Shuffle Characters in a String

Randomly rearranges the characters of the string.

function shuffleString(str) {
    return str.split('')
        .sort(() => Math.random() - 0.5)
        .join('');
}

Example:

shuffleString("hello");
// Output: Random variations like "ollhe", "hlelo"

4. Remove Vowels from a String

Removes all vowels (a, e, i, o, u) from the string.

function removeVowels(str) {
    return str.replace(/[aeiouAEIOU]/g, '');
}

Example:

removeVowels("beautiful world");
// Output: "btfl wrld"

5. Find the Most Frequent Character

Finds the character that appears most in a string.

function mostFrequentChar(str) {
    let charMap = {};
    let maxChar = '';
    let maxCount = 0;

    for (let char of str) {
        charMap[char] = (charMap[char] || 0) + 1;
        if (charMap[char] > maxCount) {
            maxCount = charMap[char];
            maxChar = char;
        }
    }
    return maxChar;
}

Example:

mostFrequentChar("success");
// Output: "s"

6. Encode String with ASCII Codes

Converts each character to its ASCII equivalent.

function encodeASCII(str) {
    return str.split('').map(char => char.charCodeAt(0)).join('-');
}

Example:

encodeASCII("hello");
// Output: "104-101-108-108-111"

7. Expand Abbreviations (Dynamic Version)

Expands common abbreviations in a string with an option for custom mappings.

function expandAbbreviations(str, customMap = {}) {
    const defaultMap = {
        "brb": "be right back",
        "gtg": "got to go",
        "idk": "I don't know",
        "imo": "in my opinion",
        "ttyl": "talk to you later"
    };
    const abbreviationMap = { ...defaultMap, ...customMap };
    return str.split(' ').map(word => abbreviationMap[word.toLowerCase()] || word).join(' ');
}

Example:

expandAbbreviations("brb I will ttyl");
// Output: "be right back I will talk to you later"

const customMap = {
    "asap": "as soon as possible",
    "np": "no problem",
    "fyi": "for your information"
};
expandAbbreviations("fyi brb asap", customMap);
// Output: "for your information be right back as soon as possible"

How to Use

• Copy the function you need.
• Paste it into your JavaScript project.
• Call the function with appropriate parameters.