JavaScript存在更新不存在插入操作

[Update if exists or add new element to array of objects - elegant way in javascript + lodash - Stack Overflow](https://stackoverflow.com/questions/25764719/update-if-exists-or-add-new-element-to-array-of-objects-elegant-way-in-javascr)

```js

 

function upsert(array, element) { // (1)
  const i = array.findIndex(_element => _element.id === element.id);
  if (i > -1) array[i] = element; // (2)
  else array.push(element);
}

const array = [
  {id: 0, name: 'Apple', description: 'fruit'},
  {id: 1, name: 'Banana', description: 'fruit'},
  {id: 2, name: 'Tomato', description: 'vegetable'}
];

upsert(array, {id: 2, name: 'Tomato', description: 'fruit'})
console.log(array);
/* =>
[
  {id: 0, name: 'Apple', description: 'fruit'},
  {id: 1, name: 'Banana', description: 'fruit'},
  {id: 2, name: 'Tomato', description: 'fruit'}
]
*/

upsert(array, {id: 3, name: 'Cucumber', description: 'vegetable'})
console.log(array);
/* =>
[
  {id: 0, name: 'Apple', description: 'fruit'},
  {id: 1, name: 'Banana', description: 'fruit'},
  {id: 2, name: 'Tomato', description: 'fruit'},
  {id: 3, name: 'Cucumber', description: 'vegetable'}
]
*/

```