检查字符串是否为空或为空的最简单方法

问题描述

我有这个检查空字符串或空字符串的代码.它正在测试中.

I've got this code that checks for the empty or null string. It's working in testing.

eitherStringEmpty= (email, password) ->
  emailEmpty = not email? or email is ''
  passwordEmpty = not password? or password is ''
  eitherEmpty = emailEmpty || passwordEmpty

test1 = eitherStringEmpty "A", "B" # expect false
test2 = eitherStringEmpty "", "b" # expect true
test3 = eitherStringEmpty "", "" # expect true
alert "test1: #{test1} test2: #{test2} test3: #{test3}"

我想知道是否有比 not email 更好的方法?或电子邮件是''.我可以通过一次调用在 CoffeeScript 中执行相当于 C# string.IsNullOrEmpty(arg) 的操作吗?我总是可以为它定义一个函数(就像我做的那样)，但我想知道语言中是否有我遗漏的东西.

What I'm wondering is if there's a better way than not email? or email is ''. Can I do the equivalent of C# string.IsNullOrEmpty(arg) in CoffeeScript with a single call? I could always define a function for it (like I did) but I'm wondering if there's something in the language that I'm missing.

推荐答案

是的:

passwordNotEmpty = not not password

或更短:

passwordNotEmpty = !!password

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