createChainedFunction

createChainedFunction.js

/**
 * @see https://github.com/react-bootstrap/react-bootstrap/blob/master/src/createChainedFunction.tsx
 */
function createChainedFunction(...funcs) {
  return funcs
    .filter(f => f !== null)
    .reduce((acc, f) => {
      if (typeof f !== 'function') {
        throw new Error('Invalid type')
      }
    
      if (acc === null) {
        return f
      }
    
      /**
       * @example
       * funcs - fn1, fn2, fn3
       * acc will be chainedFunction - fn1(acc), fn2(f)
       * f will be fn3
       */
      return function chainedFunction(...args) {
        acc.apply(this, args)
        f.apply(this, args)
      }
    }, null)
}