Recursively copies the properties of an object to another.
The difference between this and clone is that this one will copy any changes from one object to another without creating a new object. And thus is useful in memory-sensitive cases.
var obj = {
a: 'b',
c: [
new Date(),
'tobi',
'jane'
]
}
var other = {
a: 'a'
}
copy(obj,other)
// other = {a: 'b', c: [...]}
Copies all properties from obj recursively into to.
MIT