Using an object as a switch case with javascript

objLiterals.js

// obj literals with javascript

const actions = {
  'sayHello': name => `hello my friend ${name}`,
  'typeOf': value => typeof value,
  'onlyString': 'simple string',
  'default': null
} 

const reducer = (action, payload) => {
  if(!actions[action]) return actions['default']
  
  if(typeof actions[action] === 'function')
    return actions[action](payload)
  
  return actions[action]
}

reducer('sayHello', 'deadkff01')