英文:
Delete item from array inside objects
问题
const people = [{
id: 1,
documents: [{
id: 1,
category: [{
hobby: 'soccer'
}]
},
{
id: 2,
category: [{
hobby: 'soccer'
}]
}
]
},
{
id: 2,
documents: [{
id: 1,
category: [{
hobby: 'soccer'
}]
},
{
id: 2,
category: [{
hobby: 'soccer'
}]
}
]
}
];
console.log(people);
英文:
How to delete items from an array inside objects.
It should remove all the hobbies that are dance.
I tried to use splice.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
const people = [{
id: 1,
documents: [{
id: 1,
category: [{
hobby: 'soccer'
}, {
hobby: 'dance'
}]
},
{
id: 2,
category: [{
hobby: 'soccer'
}, {
hobby: 'dance'
}]
}
]
},
{
id: 2,
documents: [{
id: 1,
category: [{
hobby: 'dance'
}, {
hobby: 'soccer'
}]
},
{
id: 2,
category: [{
hobby: 'soccer'
}, {
hobby: 'dance'
}]
}
]
}
];
people.forEach(person => {
person.documents.forEach(document => {
document.category.forEach((cat, index) => {
if (cat.hobby === 'dance') {
document.category.splice(index, 1)
}
})
})
})
console.log(people);
<!-- end snippet -->
答案1
得分: 0
根本没有必要，但我个人喜欢用集合来完成这样的任务：
function deleteHobbyFrom(people, hobby) {
people.forEach(person => {
person.documents.forEach(document => {
const catAsSet = new Set(document.category)
catAsSet.forEach(cat => {
cat.hobby &&
cat.hobby === hobby &&
catAsSet.delete(cat)
})
document.category = Array.from(catAsSet)
})
})
}
我不认为我会像我在这里做的那样通常将数组转换为集合，但考虑使用集合作为数据结构可能是值得考虑的。
英文:
Not necessary at all, but I've personally liked sets for this sort of task:
function deleteHobbyFrom(people, hobby) {
people.forEach(person => {
person.documents.forEach(document => {
const catAsSet = new Set(document.category)
catAsSet.forEach(cat => {
cat.hobby &&
cat.hobby === hobby &&
catAsSet.delete(cat)
})
document.category = Array.from(catAsSet)
})
})
}
I don't think I'd normally convert from array to set back to array like I did here but could be worth considering using Set as your data structure instead of an Array.
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