Javascript build a list of location classifications

I'm attempting to create a list of categories from an array of objects named places, here is what I have tried:

            this.places.forEach((p) => {
                p.categories.forEach((c) => {
                    if(!this.categories.some(c.id)) {
                        this.categories.push(c)
                    }
                })
            })

I am using an empty array to store the categories that are being added. Since places can share categories, I need to ensure that duplicates are not added to the array. Unfortunately, the method above does not achieve this.

I also attempted the following:

this.places.forEach((p) => {
                p.categories.forEach((c) => {
                    if(!this.categories.includes(c)) {
                        this.categories.push(c)
                    }
                })
            })

This approach did not work either. Any assistance in finding a solution would be greatly appreciated.

Answer №1

Your categories check didn't have a strict enough condition set up.

this.categories.some(cat => cat.id === c.id)

Remember that .includes is only for basic types.

Make sure to iterate through each place and its categories to properly check for any missing categories before adding them to the list.

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