When we start to work on a real application, sooner or later, we come across deeply nested objects. We assume that there is a need to compare the objects with the previous values. One way to achieve this is to loop through each object recursively. We can imagine that this computation will be expensive and will require another solution.

Another way to solve this is by inspecting the reference. However, this requires us to preserve the reference if nothing has changed, and to also change the reference if any of the nested object/array prop values have changed. This task is very complicated. Although there are some libraries that help in deep comparing the objects, if we want to do it in a clean, optimized way, immutable JS is our solution. Facebook developers faced these obstacles in the very early stages of development, and hence, they developed immutable JS to overcome the issues.