@polkadot/util/string/camelCase.js

A collection of useful utilities for @polkadot

// Copyright 2017-2022 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0
// Inspired from https://stackoverflow.com/a/2970667
//
// this is not as optimal as the original answer (we split into multiple),
// however it does pass the tests (which the original doesn't) and it is still
// a 10+x improvement over the original camelcase npm package (at running)
//
// original: 20.88 μs/op
//     this:  2.86 μs/op
//
// Caveat of this: only Ascii, but acceptable for the intended usecase
function converter(fn) {
  const format = (w, i) => fn(w[0], i) + w.slice(1);

  return value => value.toString() // replace all seperators (including consequtive) with spaces
  .replace(/[-_., ]+/g, ' ') // we don't want leading or trailing spaces
  .trim() // split into words
  .split(' ') // apply the formatting
  .map((w, i) => format(w.toUpperCase() === w // all full uppercase + letters are changed to lowercase
  ? w.toLowerCase() // all consecutive capitals + letters are changed to lowercase
  // e.g. UUID64 -> uuid64, while preserving splits, eg. NFTOrder -> nftOrder
  : w.replace(/^[A-Z0-9]{2,}[^a-z]/, w => w.slice(0, w.length - 1).toLowerCase() + w.slice(-1).toUpperCase()), i)) // combine into a single word
  .join('');
}
/**
 * @name stringCamelCase
 * @summary Convert a dash/dot/underscore/space separated Ascii string/String to camelCase
 */


export const stringCamelCase = converter((w, i) => i ? w.toUpperCase() : w.toLowerCase());
/**
 * @name stringPascalCase
 * @summary Convert a dash/dot/underscore/space separated Ascii string/String to PascalCase
 */

export const stringPascalCase = converter(w => w.toUpperCase());