transform array of object into new array following with its child

问题

i have an array like this

var data = [
    {
        name: "Movies", info: "category_name",
        content: [
            { name: "Interstellar", info: "category_data" },
            { name: "Dark Knight", info: "category_data" },
        ]
    },
    {
        name: "Music", info: "category_name",
        content: [
            { name: "Adams", info: "category_data" },
            { name: "Nirvana", info: "category_data" },
        ]
    },
    {
        name: "Places", info: "category_name",
        content: [
            { name: "Jordan", info: "category_data" },
            { name: "Punjab", info: "category_data" },
        ]
    },
]

and a want to transform it into like this

var transformedArray= [
  { name: "Movies", info: "category_name" },
  { name: "Interstellar", info: "category_data" },
  { name: "Dark Knight", info: "category_data" },
  { name: "Music", info: "category_name" },
  { name: "Adams", info: "category_data" },
  { name: "Nirvana", info: "category_data" },
  { name: "Places", info: "category_name" },
  { name: "Jordan", info: "category_data" },
  { name: "Punjab", info: "category_data" },
]

i dont know what is the keyword suitable for this case , i have tried mapping it into new array but it's not same like i expected

var newArr = []

var manipulate = data.map(item => {
    return (
        newArr.push(item),
        new1.map(items => {
            return (
                new1.push(items)
            )
        })
    )
})

then how to manipulate "data" into "transformedArray"

回答1:

Use Array.prototype.flatMap(). If your browser or version of Node.js does not yet natively support this function, you can include a simple polyfill below, based on the specification:

if (!Array.prototype.flatMap) {
  Object.defineProperty(Array.prototype, 'flatMap', {
    configurable: true,
    writable: true,
    value: function flatMap (callback, thisArg = undefined) {
      return this.reduce((array, ...args) => {
        const element = callback.apply(thisArg, args);

        if (Array.isArray(element)) array.push(...element);
        else array.push(element);

        return array;
      }, []);
    }
  });
}

const data = [{name:'Movies',info:'category_name',content:[{name:'Interstellar',info:'category_data'},{name:'Dark Knight',info:'category_data'}]},{name:'Music',info:'category_name',content:[{name:'Adams',info:'category_data'},{name:'Nirvana',info:'category_data'}]},{name:'Places',info:'category_name',content:[{name:'Jordan',info:'category_data'},{name:'Punjab',info:'category_data'}]}];
const transformedArray = data.flatMap(({ content, ...o }) => [o, ...content]);

console.log(transformedArray);

回答2:

You could do this using reduce method and spread syntax ....

var data = [{"name":"Movies","info":"category_name","content":[{"name":"Interstellar","info":"category_data"},{"name":"Dark Knight","info":"category_data"}]},{"name":"Music","info":"category_name","content":[{"name":"Adams","info":"category_data"},{"name":"Nirvana","info":"category_data"}]},{"name":"Places","info":"category_name","content":[{"name":"Jordan","info":"category_data"},{"name":"Punjab","info":"category_data"}]}]

const result = data.reduce((r, {content, ...rest}) => {
  r.push({...rest}, ...content)
  return r;
}, []);

console.log(result);

You can also use concat and reduce instead of spread syntax.

var data = [{"name":"Movies","info":"category_name","content":[{"name":"Interstellar","info":"category_data"},{"name":"Dark Knight","info":"category_data"}]},{"name":"Music","info":"category_name","content":[{"name":"Adams","info":"category_data"},{"name":"Nirvana","info":"category_data"}]},{"name":"Places","info":"category_name","content":[{"name":"Jordan","info":"category_data"},{"name":"Punjab","info":"category_data"}]}]
const result = data.reduce((r, {content, ...rest}) => r.concat(rest, content), []);
console.log(result);

来源：https://stackoverflow.com/questions/58355959/transform-array-of-object-into-new-array-following-with-its-child