最好的转换方式是什么:
['a','b','c']
to:
{
0: 'a',
1: 'b',
2: 'c'
}
最好的转换方式是什么:
['a','b','c']
to:
{
0: 'a',
1: 'b',
2: 'c'
}
当前回答
令I = 0; let myArray = ["first", "second", "third", "fourth"]; const arrayToObject = (arr) => 对象。分配(arr{},……。Map (item => ({[i++]: item}))); console.log (arrayToObject (myArray));
或使用
myArray = ["first", "second", "third", "fourth"] console.log (myArray{…})
其他回答
为了完整性,ECMAScript 2015(ES6)正在传播。将需要一个转译器(Babel)或至少运行ES6的环境。
console.log ( {…['a', 'b', 'c']} )
下面的方法将数组转换为具有特定给定键的对象。
/**
* Converts array to object
* @param {Array} array
* @param {string} key (optional)
*/
Array.prototype.ArrayToObject = function(key) {
const array = this;
const obj = {};
array.forEach((element, index) => {
if(!key) {
obj[index] = element;
} else if ((element && typeof element == 'object' && element[key])) {
obj[element[key]] = element;
}
});
return obj;
}
前任-
[{名称:“测试”},{名称:test1的}].ArrayToObject(“名字”);
会给
{test: {name: 'test'}, test1: {name: 'test1'}}
并且incase key没有作为参数提供给该方法
i.e. [{name: 'test'}, {name: 'test1'}].ArrayToObject();
会给
{0: {name: 'test'}, 1: {name: 'test1'}}
import books from "./books.json";
export const getAllBooks = () => {
return {
data: books,
// a=accoumulator, b=book (data itelf), i=index
bookMap: books.reduce((a, book, i) => {
// since we passed {} as initial data, initially a={}
// {bookID1:book1, bookID2:i}
a[book.id] = book;
// you can add new property index
a[book.id].index=i
return a;
// we are passing initial data structure
}, {}),
};
};
我会使用下划线,但如果没有的话我会使用reduce,初始值为空对象{}
>>> ['a', 'b', 'c'].reduce(function(p, c, i) {p[i] = c; return p}, {})
Object { 0="a", 1="b", 2="c"}
reduce应该在今天的大多数浏览器中广泛使用,参见MDN
最短的答案:(使用解构)
const obj = { ...input }
例子:
const inputArray = ["a", "b", "c"]
const outputObj = { ...inputArray }