Control Flow

Switch Case

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用 Strategy Pattern 代替 switch/case 语句:

function doAction(action) {
  const actions = {
    hack() {
      return 'hack'
    },

    slash() {
      return 'slash'
    },

    run() {
      return 'run'
    },
  }

  if (typeof actions[action] !== 'function')
    throw new TypeError('Invalid action.')

  // 闭包方法集
  return actions[action]()
}