检测空值

is-empty.js

/**
 * 检测空值
 * by: molvqingtai 2019-8-16
 * @param  {[all]} value [检测对象]
 * @return {[Boolean]}   [是否为空]
 */
const typesMap = new Map([
  ['[object Null]', value => true],
  ['[object Date]', value => false],
  ['[object Math]', value => false],
  ['[object Number]', value => false],
  ['[object Symbol]', value => false],
  ['[object Boolean]', value => false],
  ['[object Function]', value => false],
  ['[object Undefined]', value => true],
  ['[object String]', value => !value],
  ['[object Set]', value => !value.size],
  ['[object Map]', value => !value.size],
  ['[object Array]', value => !value.length],
  ['[object Object]', value => !Object.entries(value).length]
])

const isEmpty = value => typesMap.get(Object.prototype.toString.call(value))(value)

export default isEmpty