javascript - 如何修改数组中对象的属性

Question

首先请注意，这是我的 Redux 代码中的一个问题 HERE .

好吧，假设我想将“状态”的属性从“待定”编辑为“已删除”，再到数组中对象的特定属性，我将如何使用 Object.Assign 来完成此操作以下示例:

示例 a:(注意对象数组存储在对象本身中)

const plan = {
  task: [
    {
        id: 1,
        description: "This is a task",
        status: "pending"
    },
    {
        id: 2,
        description: "This is a second task",
        status: "pending"
    }
  ]
}

示例 b:(元素为对象的简单元素数组)

const task2 = [
    {
        id: 1,
        description: "This is a task",
        status: "pending"
    },
    {
        id: 2,
        description: "This is a second task",
        status: "pending"
    }
]

Answer 1

好问题。您打算做的态射通常称为透镜(实际上是更大的态射组)。

你可以用纯JavaScript来实现，例如:

// Return a new object with the very same structure as plan and an amended list of tasks
return Object.assign({}, plan, {
  tasks: plan.tasks.map(function (task) {
    // Map every existing task to a totally new object with the very same structure and a new status
    return Object.assign({}, task, { status: "deleted" })
  })
})

第二个例子更容易变形，检查下面的代码:

return task2.map(function (task) {
  // Return a totally new object with the very same structure as task and a new status
  return Object.assign({}, task, { status: "deleted" });
})

此外，还有一些库可以完全满足您的需求，例如nanoscope