preact-gestures/dist-src/utils.js

Preact compatible HOCs for gesture detection

export function series(funcs) {
  return (...args) => funcs.forEach(f => f(...args));
}
export function splitCamelCase(string) {
  return string.split(/(?=[A-Z])/g);
}
export function safeAppend(target, value) {
  if (Array.isArray(target)) return target.concat([value]);else return [target, value];
}
export function mergeWith(resolver, objA, objB) {
  let result = Object.assign({}, objA);
  Object.entries(objB).forEach(([key, value]) => {
    if (key in result) {
      result[key] = safeAppend(result[key], value);
    } else {
      result[key] = [value];
    }
  });
  Object.entries(result).forEach(([key, values]) => {
    if (values.length === 1) result[key] = values[0];else result[key] = resolver(values, key);
  });
  return result;
} // export function filterObj (obj, pred) {
//   let result = {}
//   Object.entries(obj)
//     .forEach(([key, val]) => pred(key, val) ? result[key] = val : undefined)
//   return result
// }

export function mapObj(obj, mapper) {
  let result = {};
  Object.entries(obj).forEach(([key, val]) => result[key] = mapper(key, val));
  return result;
}
export function setPath(obj, path, value) {
  const pathParts = path.slice();
  const propToSet = pathParts.pop();
  let current = obj;
  pathParts.forEach(p => {
    if (typeof current[p] !== 'object') current[p] = {};
    current = current[p];
  });
  current[propToSet] = value;
}