_.isString(value)

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_.isString(value)

_.isString判断一个值是否是字符串对象或者字符串值

参数

value (*): 需要检查的值

返回值

(boolean): 如果是String对象返回true，否则false

例子

_.isString('abc');
// => true
 
_.isString(1);
// => false

源代码

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

/**
 * Checks if `value` is classified as a `String` primitive or object.
 *
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a string, else `false`.
 * @example
 *
 * isString('abc')
 * // => true
 *
 * isString(1)
 * // => false
 */
//判断一个值是否是字符串对象或者字符串值
function isString(value) {
  const type = typeof value
  return type == 'string' || (type == 'object' && value != null && !Array.isArray(value) && getTag(value) == '[object String]')
}

export default isString