对象转数组形式（从对象创建`键-值`对数组）

const keyValuePairsToArray = object => Object.keys(object)
  .map(el => [el, object[el]])

// 事例
keyValuePairsToArray({Better: 4, Programming: 2})
// [['Better', 4], ['Programming', 2]]

keyValuePairsToArray({x:1, y:2, z:3})
// [['x', 1], ['y', 2], ['z', 3]]