Getting error: Cannot modify a value type return value of `UnityEngine.Rigidbody.velocity'. Consider storing the value in a temporary variable

Questions & Answers
1

I made a program using javascript, but I am curently learning C# so I wanted to transfer
it over. I think I fixed most of the problems but this one:
Cannot modify a value type return value of `UnityEngine.Rigidbody.velocity’. Consider storing the value in a temporary variable

    using UnityEngine;
    using System.Collections;
        
    public class MYCLASSNAME : MonoBehaviour
    {
        
        int rotationSpeed= 100;
        int jumpHeight= 8;
        
        bool isFalling = false;
        
        void  Update ()
        {
            //Left to Right, A and D
            float rotation = Input.GetAxis ("Horizontal") * rotationSpeed;
            rotation *= Time.deltaTime;
            rigidbody.AddRelativeTorque(Vector3.back * rotation);
        
            if (Input.GetKeyDown (KeyCode.Space) && isFalling == false)
            {
                rigidbody.velocity.y = jumpHeight;
            }
            isFalling = true;
        }
        void OnCollisionStay ()
        {
            isFalling = false;
        }
        
    }
2

This:

rigidbody.velocity.y = jumpHeight;

Could be:

Vector3 v = rigidbody.velocity;
v.y = jumpHeight;
rigidbody.velocity = v;

You could name it whatever you want, but that’s pretty much the temp variable pattern they’re suggesting.

As an alternative, you can use AddForce() to accomplish roughly the same thing:

rigidbody.AddForce(Vector3.up * jumpHeight, ForceMode.VelocityChange);