Book Updates

-add chapter 3.2

Author: ktechhydle

book/chapter3.2.md

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+---
+title: "Chapter 3.2"
+---
+
+# Chapter 3.2: Walk and While
+
+## Loops
+
+When you need to run a block of code multiple times, you use a **loop**.
+
+Loops let your program “cycle” through code, whether that’s repeating an action _x_ number of times or continuing until a condition changes.
+
+GLang gives you two main ways to loop: `while` and `walk`.
+
+## `while`
+
+A `while` loop is basically an `if` statement that keeps running **while** a condition remains true.
+If that condition never becomes false, your loop will run forever (and probably melt your computer’s hardware).
+
+```
+while true {
+    bark("This loop runs forever!!!");
+}
+````
+
+Of course, infinite loops aren’t always bad, sometimes you want your program to keep running until something happens. For example, you might want to increment a value until it hits a goal.
+
+```
+obj x = 0;
+
+while x != 100 {  # stops when x == 100
+    x = x + 1;
+}
+```
+
+A classic example is a game loop that runs while the game is active:
+
+```
+while game_is_running() {
+    render_opponent();
+    render_player();
+}
+```
+
+## `walk`
+
+The `walk` loop gives you more **control**. Instead of looping until some condition changes, you define exactly how many times it should run.
+
+```
+walk i = 0 through 10 {
+    bark(i);
+}
+```
+
+Here’s what happens:
+
+- `i` starts at 0
+- The loop runs while `i` is less than 10
+- Each time through, `i` increases by 1 automatically
+
+So this prints: `0, 1, 2, 3, 4, 5, 6, 7, 8, 9`.
+
+You can also control how much `i` increases each time with the optional `step` keyword:
+
+```
+walk i = 0 through 10 step = 2 {
+    bark(i); # outputs 0, 2, 4, 6, 8
+}
+```
+
+## Your Challenge 🤔
+
+Use a `walk` loop to output numbers 0 - 10000 counting by 100s (0, 100, 200).
+
+::: details Answer
+```
+walk i = 0 through 10000 step = 100 {
+    bark(i);
+}
+```
+:::