gistfile1.txt

        const materialTypeReducer = (acc: { [materialType: string]: number }, current: Silo) => {
            const material = current.material.replace(" ", "");

            if (Object.keys(acc).indexOf(material) === -1) {
                acc[material] = current.weight;
            }
            else {
                acc[material] += current.weight;
            } return acc;
        };


        const materialTypeObj = this.silos.filter((item) => item.material).reduce(materialTypeReducer, {} as { [materialtype: string]: number });