javascript - Judgment condition question

Question

if(+g == 1){
    //do something
    }

How to explain g == 1 in this code?

Answer 1

Unary operator+表示 正号, g如果是一个非法的数,+g将得到NaN, such as string:

console.log(+'hello')
// > NaN

If it is a legal number, then it is 取他的正值:

console.log(+-3)  // +(-3)
// > -3

Then determine whether it is equal to 1.

Answer 2

After adding + in front of the variable, the variable will be converted into a number and numerical operations can be performed

Answer 3

The meaning of converting variables into numbers.

Answer 4