simple-string-utils-study/index.js

Simple string utility functions for study purposes

function capitalize(str) {
  if (typeof str !== 'string' || str.length === 0) {
    return str;
  }
  return str.charAt(0).toUpperCase() + str.slice(1).toLowerCase();
}

function reverse(str) {
  if (typeof str !== 'string') {
    return str;
  }
  return str.split('').reverse().join('');
}

function kebabCase(str) {
  if (typeof str !== 'string') {
    return str;
  }
  return str
    .replace(/([a-z])([A-Z])/g, '$1-$2')
    .replace(/\s+/g, '-')
    .toLowerCase();
}

function wordCount(str) {
  if (typeof str !== 'string') {
    return 0;
  }
  return str.trim().split(/\s+/).filter(word => word.length > 0).length;
}

module.exports = {
  capitalize,
  reverse,
  kebabCase,
  wordCount
};