PhpStorm complains about adding key value to an array

Question

I have the following code:

            let self = this;
          
            for (const questionIndex in self.questions) {
                self.givenAnswers[questionIndex] = "";
            }

And PhpStorm is complaining about the line self.givenAnswers[questionIndex] = ""; saying that I need to check if the object has the property. The full message is:

Possible iteration over unexpected (custom / inherited) members, probably missing hasOwnProperty check.

But the givenAnswers variable is an array and not an object, and I want to append new key and values. How do I remove the warning, or is there anything wrong with the code?

CertainPerformance · Accepted Answer · 2021-01-18 06:59:50Z

1

While you could add a hasOwnProperty check to fix the warning:

for (const questionIndex in self.questions) {
    if (self.questions.hasOwnProperty(questionIndex)) {
        self.givenAnswers[questionIndex] = "";
    }
}

If it's an array, I think iterating from 0 to its length would be less verbose:

for (let i = 0; i < self.questions.length; i++) {
    self.givenAnswers[i] = "";
}

answered Jan 18, 2021 at 6:59

CertainPerformance

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1 Comment

naneri Over a year ago

Ok, the first one helped me to resolve the issue. It does seem kinda stupid for me on PHPStorm side - that if I am iterating over object keys - the object should have the key and why should it complain then. oO

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