cannot double jump

Questions & Answers
1

public class playercontroller2d : MonoBehaviour
{
Animator animator;
Rigidbody2D rb2d;
SpriteRenderer spriteRenderer;

//Booleans
public bool isgrounded;
public bool candoublejump;

[SerializeField]
Transform groundcheck;

[SerializeField]
Transform groundcheckl;

[SerializeField]
Transform groundcheckr;

[SerializeField]
private float runspeed;

[SerializeField]
private float putyourfuckingassup;

// Start is called before the first frame update
void Start()
{

    animator = GetComponent<Animator>();
    rb2d = GetComponent<Rigidbody2D>();
    spriteRenderer = GetComponent<SpriteRenderer>();

}

private void FixedUpdate()
{
    if ((Physics2D.Linecast(transform.position, groundcheck.position, 1 << LayerMask.NameToLayer("ground"))) ||
        (Physics2D.Linecast(transform.position, groundcheckl.position, 1 << LayerMask.NameToLayer("ground"))) ||
        (Physics2D.Linecast(transform.position, groundcheckr.position, 1 << LayerMask.NameToLayer("ground"))))

    {
        isgrounded = true;
    }
    else
    {

        isgrounded = false;

    }
    {
        {
            if (Input.GetKey("d"))
            {

                rb2d.velocity = new Vector2(runspeed, rb2d.velocity.y);

                if (isgrounded)

                    animator.Play("run");

                spriteRenderer.flipX = false;
            }
            else if (Input.GetKey("a"))
            {
                rb2d.velocity = new Vector2(-runspeed, rb2d.velocity.y);

                if (isgrounded)

                    animator.Play("run");

                spriteRenderer.flipX = true;

            }
            else
            {
                if (isgrounded)

                    animator.Play("idle");

                rb2d.velocity = new Vector2(0, rb2d.velocity.y);
            }

            if (Input.GetKey("space"))
            {
                if (isgrounded)
                {
                  rb2d.velocity = new Vector2(rb2d.velocity.x , putyourfuckingassup);
                    

                    animator.Play("jump");

                    candoublejump = true;
                }
                else
                {
                    if (candoublejump)
                    {
                        candoublejump = false;
                        rb2d.velocity = new Vector2(rb2d.velocity.x, putyourfuckingassup);
                        rb2d.AddForce(Vector2.up * putyourfuckingassup);

                        animator.Play("jump");
                    

                    }
                }
            }

        }
    }
}

}

2

First thing I notice is that you are using GetKey("space") rather than GetKeyDown("space") which is likely causing you to double jump every jump. If you swap that over an it still doesn’t work then you will need to look at your isgrounded and make sure that this is working properly by putting some Debug.Logs in and making sure the value is correct