_.isSet(value)

156

_.isSet(value)

_.isSet判断一个值是否被归类为set对象

参数

value (*): 需要检查的值

返回值

(boolean): 如果是Set对象返回true，否则false

例子

_.isSet(new Set);
// => true
 
_.isSet(new WeakSet);
// => false

源代码

import getTag from './.internal/getTag.js'
import nodeTypes from './.internal/nodeTypes.js'
import isObjectLike from './isObjectLike'

/* Node.js helper references. */
const nodeIsSet = nodeTypes && nodeTypes.isSet

/**
 * Checks if `value` is classified as a `Set` object.
 *
 * @since 4.3.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a set, else `false`.
 * @example
 *
 * isSet(new Set)
 * // => true
 *
 * isSet(new WeakSet)
 * // => false
 */
//判断一个值是否被归类为set对象
const isSet = nodeIsSet
  ? (value) => nodeIsSet(value)
  : (value) => isObjectLike(value) && getTag(value) == '[object Set]'
  //如果是nodejs环境，使用node提供的帮助函数
  //否则判断是否是object-like对象和toStringTag
export default isSet