如何用一行代码展平嵌套对象？

Flattening Nested Objects with a One-Liner

To flatten nested objects, you can employ the following one-line solution:

Object.assign({}, ...function _flatten(o) { return [].concat(...Object.keys(o).map(k => typeof o[k] === 'object' ? _flatten(o[k]) : ({[k]: o[k]})))}(yourObject))

This one-liner can flatten objects with nested properties, converting them into flat objects with one-level properties.

How It Works:

1. Recursive Function _flatten: The function recursively traverses the object, flattening any nested properties.
2. Spread Operator (ES6): Inside the _flatten function, the spread operator ... is used to create an array of one-property objects from each property in the object ({[k]: o[k]}).
3. Concatenation: The Object.keys(o) function returns an array of property names, and the [].concat function is used to concatenate the arrays of one-property objects into a single array.
4. Object.assign Function (ES6): The Object.assign function is used to combine the flattened arrays of one-property objects into a single, flattened object.

Example:

Using the example object:

{
  a: 2,
  b: {
    c: 3
  }
}

The one-line solution will produce the flattened object:

{
  a: 2,
  c: 3
}

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