Coffeescript

Question

在 Coffeescript 中，这些 if 和 unless 语句可以成为一行代码吗？

# ensure both variables are present
if var1 and var2
    # ensure the variables are different
    unless var1 is var2
        # now do something!

我需要两个变量都存在并且两者不同。

Answer 1

只需在第一个if中添加a is b的补码，Javascript将从左边开始计算表达式（短路），它不会测试a isnt b除非它们都被定义

# Your example boils down to this
if a and b and a isnt b
     # Do something

# Why not Use a? to check if a is defined
if a? and b? and a isnt b
     # Do something

Coffeescript - 减少存在和不相同的代码行？

Coffeescript - Reduce lines of code for presence and non-same?

javascript