Returns

{Array}:

a list of Patch objects representing the differences

Returns the difference between two ArrayLike objects (that have nonnegative integer keys and the length property) as an array of patch objects.

A patch object returned by this function has the following properties:

• index: the index of newList where the patch begins
• deleteCount: the number of items deleted from that index in newList
• insert: an Array of items newly inserted at that index in newList

var diff = require("can-util/js/diff/diff");

console.log(diff([1], [1, 2])); // -> [{index: 1, deleteCount: 0, insert: [2]}]
console.log(diff([1, 2], [1])); // -> [{index: 1, deleteCount: 1, insert: []}]

// with an optional identity function:
diff(
    [{id:1},{id:2}],
    [{id:1},{id:3}],
    (a,b) => a.id === b.id
); // -> [{index: 1, deleteCount: 1, insert: [{id:3}]}]