.assign(target, source)

Copies the values (and properties if map-like) from source onto target.

For map-like objects, every enumerable property on target is copied:

var target = {};
var source = {key : "value"};
var restult = canReflect.assign(target, source);
result === target //-> true
target //-> {key : "value"}

For Arrays, enumerated values are copied over, but the length of the array will not be trunkated. Use update for trunkating.

var target = ["a","b","c"];
var source = ["A","B"];
canReflect.assign(target, source);
target //-> ["A","B","c"]