Case Replacement

case-replacement.js

/** dash between num-letter */ const dbnl = [/(\d)([a-zA-Z])|([a-zA-Z])(\d)/g, '$1$3-$2$4'];
/** special characters to dash */ const sc2d = [/[^a-zA-Z0-9]+/g, '-'];
/** uppercase to dash */ const u2d = [/([A-Z])/g, '-$1'];
/** Common preconversion */
const commonPre = fn => cacheStringFunction(str => fn(str.replace(...u2d).replace(...dbnl).replace(...sc2d)));

/** dash before a letter */ const dbl = /-([a-zA-Z])/g;

export const capitalizeWords = cacheStringFunction(str => str.toLowerCase().replace(/\b(\w)/g, (_, c) => (c ? c.toUpperCase() : '')));

export const toCamelCase = commonPre(str => str.replace(dbl, (_, c) => (c ? c.toUpperCase() : '')));

export const toKebabCase = commonPre(str => str.toLowerCase());

export const toSnakeCase = commonPre(str => str.replace(dbl, (_, c) => (c ? `_${c}` : '')).toLowerCase());


export const cacheStringFunction = fn => {
  const cache = {};
  return str => cache[str] || (cache[str] = fn(str));
};