Assigning an array shorter than previous one results in merged array

[JonnyBurger]

I have encountered this problem when I tried to remove an object from an array and re-assign it to an object.

I have broken down the problem into this simple example:

const deepAssign = require('deep-assign');

const result = deepAssign({}, {
  a: [1, 2]
}, {
  a: [3]
});
console.log(result.a) // => [3, 2]

I expected result.a to be [3] instead.
The native Object.assign from v8 yields a different result:

const result = Object.assign({}, {
  a: [1, 2]
}, {
  a: [3]
});
console.log(result.a) // => [3]

This leads me to believe that this is a bug in deep-assign.

[schnittstabil]

deep-assign is recusive, thus the base case of your example should be:

Object.assign([1, 2], [3])
//=> [ 3, 2 ]

[sindresorhus]

This module is now deprecated: b332062