Branch and repeat

your project so far

Last reading lesson. The nested for loop here becomes the block grid in lesson 08.

Last C# lesson. Two structures — a fork and a repeat — cover almost all gameplay code.

animated diagram

if picks one road. for runs the same block a fixed number of times.

Deciding

C# script

if (hp <= 0)          Die();
else if (hp < 30)     PlayLowHealthSound();
else                  /* fine */ ;

// combine conditions
if (isGrounded && Input.GetKeyDown(KeyCode.Space)) Jump();   // && = and
if (isStunned || isDead) return;

Repeating

C# script

// run 5 times, i = 0,1,2,3,4
for (int i = 0; i < 5; i++)
    Debug.Log("cube " + i);

// grid: 4 x 4 = 16 times
for (int x = 0; x < 4; x++)
    for (int z = 0; z < 4; z++)
        Debug.Log(x + "," + z);

Lists — many things at once

needs: using System.Collections.Generic;

using System.Collections.Generic;

public List<GameObject> characters = new List<GameObject>();

void Start()
{
    characters.Add(knight);                 // add
    Debug.Log(characters.Count);
    GameObject first = characters[0];       // index starts at 0

    foreach (GameObject c in characters)    // walk through all
        c.SetActive(false);
}

Indexes start at 0, so a list of 3 has indexes 0, 1 and 2.
Use for when you need the number i; use foreach when you just need each item.
A public List shows up in the Inspector as a drag-and-drop slot list — that is how the character swap will work.