javascript - JS/ES6 : How to get specific fields of object array and return a single object with specific value?

Question

有一个像这样的对象数组:

const schema = [
    { placeholder: 'Title', name: 'title' },
    { placeholder: 'Authors', name: 'author' },
    { placeholder: 'Publisher',  name: 'publisher', optional: true },
    { placeholder: 'Edition', name: 'edition', optional: true }
]

现在我想获取一个对象，其中所有 name 字段作为键，具有 1 值:

result = { 'title': 1, 'author': 1, 'publisher': 1, 'edition': 1 }

我尝试使用 map ，但是

schema.map(o => { return o.name })

只给我一个数组:

['title', 'author', 'publisher', 'edition']

Answer 1

您需要减少

const schema = [
    { placeholder: 'Title', name: 'title' },
    { placeholder: 'Authors', name: 'author' },
    { placeholder: 'Publisher',  name: 'publisher', optional: true },
    { placeholder: 'Edition', name: 'edition', optional: true }
]

console.log(schema.reduce((acc, {name}) => (acc[name] = 1, acc), {}))