If true, then a new value will be concatenated with the old
const obj = {a: {b: 1}};Object.set(obj, 'a.b', 2, {concat: true})console.log(obj); // [1, 2]
Character to declare the path
Object.get({a: {b: 1}}, 'a:b', {separator: ':'})
Function to set a value
If true, then a new value will be concatenated with the old