react-formal/esm/utils/updateIn.js

Classy HTML form management for React

import prop from 'property-expr';
const IS_ARRAY = /^\d+$/;
function isQuoted(str) {
  return !!(typeof str === 'string' && str && (str[0] === '"' || str[0] === "'"));
}
function copy(value) {
  return Array.isArray(value) ? value.concat() : value !== null && typeof value === 'object' ?
  //
  // @ts-ignore
  Object.assign(new value.constructor(), value) : value;
}
function clean(part) {
  return isQuoted(part) ? part.substr(1, part.length - 2) : part;
}
export default function update(model, path, value) {
  let parts = prop.split(path);
  let newModel = copy(model);
  let part;
  let islast;
  if (newModel == null) newModel = IS_ARRAY.test(parts[0]) ? [] : {};
  let current = newModel;
  for (let idx = 0; idx < parts.length; idx++) {
    islast = idx === parts.length - 1;
    part = clean(parts[idx]);
    if (islast) current[part] = value;else {
      current = current[part] = current[part] == null ? IS_ARRAY.test(parts[idx + 1]) ? [] : {} : copy(current[part]);
    }
  }
  return newModel;
}