How do I check the value of an object's animation name in an 'if' statement?

Code (CSharp):

1.                 if (gameObject.GetCurrentAnimatorStateInfo(0).IsName("Walk Left")) {
2.                     // Check if animation is walking left, so that left idle animation can play
3.                 }
4.                 if (gameObject.GetCurrentAnimatorStateInfo(0).IsName("Walk Right")) {
5.                     // Check if animation is walking right, so that right idle animation can play
6.                 }
7.                 if (gameObject.GetCurrentAnimatorStateInfo(0).IsName("Walk Up")) {
8.                     // Check if animation is walking up, so that up idle animation can play
9.                 }
10.                 if (gameObject.GetCurrentAnimatorStateInfo(0).IsName("Walk Down")) {
11.                     // Check if animation is walking down, so that left down animation can play
12.                 }

I'm trying to use an idle animation per direction.
I tried this code in the UPDATE void, but it returns
Type `UnityEngine.GameObject' does not contain a definition for `GetCurrentAnimatorStateInfo' and no extension method `GetCurrentAnimatorStateInfo' of type `UnityEngine.GameObject' could be found. Are you missing an assembly reference?
How do I fix this code?

 

Possibly you may be missing animator component
https://docs.unity3d.com/ScriptReference/Animator.GetCurrentAnimatorStateInfo.html