If you’re plant lost all its leaves or all the leaves turned brown, don’t immediately go replace it.  You’re plant may still be alive.  With a bit of patience and care, your plant may recover.  If you would prefer immediate results, then just replace the plant.

The easiest way to tell if your plant is still alive is to check the stem.  The stem should be pliable, green, and be green on the inside if you scratch away a bit of the outer layer.  If your plant’s stem is mushy or brittle, then your plant has died and you need to replace it.

To help your plant recover, you should first trim away the dead parts of the plant and stem.  Then, place the plant in a spot where it receives half as much sunlight as usual, or where it receives indirect light.  Water only when the soil is dry, but do not let the soil dry out completely, i.e. it is important not to overwater. 

In 3-4 weeks you should see new stems and leaves being produced!