CODEWITHSUNDEEP
javascriptclassecmascript-6instanceoftypechecking
Steven
Steven

Reputation: 19

(obj instanceof ObjectClass) not working?

Given the class:

class Day {
    constructor(year, month, day) {
        this._moment = new Moment()
        this.year = year || this._moment.year()
        this.month = month || this._moment.month()
        this.day = day || this._moment.date()
    }
}

I have let day = new Day() and pass that through a couple function calls. But later I check this object with day instanceof Day and it returns false. When I console.log(day) in chrome I get Day {_moment: Moment, year: 2016, month: 9, day: 17}.

With having the prefix of Day in the console log just before I check with instanceof cannot figure out why day instanceof Day is returning false.

Any ideas?

edit:

console.log('Day: ', day)
console.log('Day: ', typeof day)
console.log('Day: ', day instanceof Day)

Output:

Day:  Day {_moment: Moment, year: 2016, month: 9, day: 17}
    _moment: Moment
    day: 17
    month: 9
    year: 2016
    __proto__: Object(anonymous function)
Day:  object
Day:  false

Upvotes: 0

Views: 536

Answers (1)

Steven Bayer
Steven Bayer

Reputation: 2127

@Bergi was correct, in one import of the Day class I wrote: import Day from '../lib/Day'

Webpack then generated another type of Day that was being used in that part of my codebase. Tip: always use lower case string on imports and require.

Upvotes: 2

Related Questions