앵귤러 강의 노트

reduce 메서드

carParts = [{
    id: 1,
    name: "Super Tires",
    description: "These tires are very best",
    price: 2000,
    inStock: 5
},{
    id: 2,
    name: "Reinforced Shocks",
    description: "Shocks made from kryptonite",
    price: 23000,
    inStock: 4
},{
    id: 3,
    name: "Padded Seats",
    description: "Super soft seats for smooth ride",
    price: 4000000,
    inStock: 0
}];

totalCarParts(): number{
    /*let sum = 0;
    for(let carPart of this.carParts){
        sum += carPart.inStock;
    }
    return sum;*/
    return this.carParts.reduce((amount, current) => amount + current.inStock, 0);
}

component는 NgModule의 declarations에 등록한다