Default parameter problem
西伯利亚狼
西伯利亚狼 2021-06-17 20:56:32
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Teacher, in the example you gave:

function func2(param1, param2) {

param1 = arguments[0] ? param1 : 600;

param2 = arguments[1] ? param1 : 300;

}

This ternary operator, if I call it like this: func(0, 0,);

I pass in If the parameter is 0, it will actually be judged as failure, and param1 and param2 will be assigned values ​​of 600 and 300

西伯利亚狼
西伯利亚狼

reply all(1)
Peter_Zhu

It is inappropriate to set default parameter values ​​in this way. In fact, js now supports default parameters, so there is no need for such trouble (es6)

  • reply Teacher, what I mean is how to solve the problem of incorrect judgment of 0 and null by the ternary operator. When I was using objects, I encountered a link judgment: obj?.user?.first name?? undefined Not sure if this method can be applied to the above example!
    西伯利亚狼 author 2021-06-21 10:44:47
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