英文:
Getting NaN on reduce() method
问题
I am working with ReactJS. I have a JSON Object like this:
[{"id": "1","category": "cellphones","name": "Xiaomi Redmi Note 10","stock": "99","price": "100","quantity": "3"},{"id": "2","category": "cellphones","name": "Iphone 11","stock": "3","price": "1000","quantity": "5"},{"id": "3","category": "laptops","name": "MSI GF65 Thin","stock": "40","price": "2000","quantity": "2"}]
And I want to get the overall total of these items by doing something like this:
const getAllTotal = () => {const sum = cartItems.reduce((prev, next) => prev.quantity * prev.price + next.quantity * next.price,0);console.log(sum);return sum;};
The thing is, every time I call that function, the console returns NaN.
I first thought it was caused by the type of the keys, so I tried to enclose said keys into the parseInt() method, but it returned the same NaN. What am I doing wrong?
英文:
I am working with ReactJS. I have a JSON Object like this:
[{"id": "1","category": "cellphones","name": "Xiaomi Redmi Note 10","stock": "99","price": "100","quantity": "3"},{"id": "2","category": "cellphones","name": "Iphone 11","stock": "3","price": "1000","quantity": "5"},{"id": "3","category": "laptops","name": "MSI GF65 Thin","stock": "40","price": "2000","quantity": "2"}]
And i want to get the overall total of this items by doing something like this:
const getAllTotal = () => {const sum = cartItems.reduce((prev, next) => prev.quantity * prev.price + next.quantity * next.price,0);console.log(sum);return sum;};
The thing is, everytime i call that function, the console returns NaN.
I first thought it was caused by the type of the keys, so i tried to enclose said keys into the parseInt() method, but it returned the same NaN. What am i doing wrong?
答案1
得分: 4
我认为你没有正确使用array.reduce()方法。这是正确的形式，请尝试：
const getAllTotal = () => {const sum = cartItems.reduce((prev, next) => prev + next.quantity * next.price,0);console.log(sum);return sum;};
查看此链接以获取array.reduce()方法的正确实现。
英文:
I think you are not using array.reduce() method properly. Here is the correct form try this:
const getAllTotal = () => {const sum = cartItems.reduce((prev, next) => prev + next.quantity * next.price,0);console.log(sum);return sum;};
Take a look at this link for proper implementation of array.reduce() method
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