以不可变的方式过滤 2 层数组对象

Question

我有一个以下格式的对象数组，旨在过滤immutable way.可以使用pure javascript、es6或lodash库来完成。

注意：这里的关键点是immutable way中的过滤器。

逻辑：

if (all product qty in the first level object is empty string or 0) {
do not show that first that level object
}
if (product qty is empty string or 0) {
do not show that product
}

输入：

let targetArray = [{
recipient: '1',
product: [{
productId: '1',
qty: '2'
}, {
productId: '2',
qty: '0'
}
]
}, {
recipient: '2',
product: [{
productId: '1',
qty: '0'
}, {
productId: '3',
qty: ''
}
]
},
]

预期产出：

[
{
recipient: '1',
product: [{
productId: '1',
qty: '2'
}]
}
]

Answer 1

我会为此使用 reduce

let targetArray = [
{
recipient: '1',
product: [{
productId: '1',
qty: '2'
}, {
productId: '2',
qty: '0'
}]
},
{
recipient: '2',
product: [{
productId: '1',
qty: '0'
}, {
productId: '3',
qty: ''
}]
},
]
let filtered = targetArray.reduce((acc,curr) => {
let products = curr.product.filter(product => parseInt(product.qty) > 0);

if (products.length === 0) {
return acc;
}

acc.push({...curr, product: products});
return acc;
}, [])
console.log({filtered});
console.log({targetArray});