[Vuejs]-How to get remaining percentage of a value?

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Ok I figured it out, after messing a bit with Excel:

updateRarities(trait, raritySlider){
        var property = this.currentCollection.properties.items.find(property => property.id === trait.propertyID);

        // sum of every raritySlider
        let sumOfSliders = 0;
        for (let i = 0; i < property.traits.items.length; i++) {
            sumOfSliders = Number(sumOfSliders) + Number(property.traits.items[i].raritySlider);
        }
        
        for (let i = 0; i < property.traits.items.length; i++) {
            if (property.traits.items[i].id !== trait.id) {
                let updatedTrait = {
                    id: property.traits.items[i].id,
                    // calculate the rarity of the other traits 
                    rarity: 1/sumOfSliders*property.traits.items[i].raritySlider,
                    updatedAt: new Date(),
                }
                API.graphql(graphqlOperation(mutations.updateTrait, { input: updatedTrait}));
            }
            else {
                let updatedTrait = {
                    id: trait.id,
                    rarity: 1/sumOfSliders*raritySlider,
                    raritySlider: raritySlider,
                    updatedAt: new Date(),
                }
                API.graphql(graphqlOperation(mutations.updateTrait, { input: updatedTrait}));
            }
        }
    }

I just needed to sum the value of the sliders.

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