# Loops

<https://create.roblox.com/docs/tutorials/fundamentals/coding-4/repeating-code-with-while-loops>\
<https://create.roblox.com/docs/tutorials/fundamentals/coding-4/intro-to-for-loops>\
<https://create.roblox.com/docs/luau/control-structures#repeat-loops>\
\
In this section, we will be discussing about loops. What are loops? Loops are code blocks that can store a block of code and repeat that block of code. In Roblox, we got **for loops**, **while loop**, and **repeat loop**. **for loops** can be used to countdown and loop through a table, a **while loop** can be used to repeat a block of code with a condition, and the **repeat loop** can be used to repeat a block of code until a condition is met. In a loop, we got "<mark style="color:red;">**continue**</mark>" and "<mark style="color:red;">**break**</mark>". <mark style="color:red;">**Break**</mark> is used to stop a current running loop and continue the code blocks that are below the loop and <mark style="color:red;">**continue**</mark> is used to move to the next iteration.

### WHILE LOOP USAGE

```lua
local myBool = true

while myBool then -- If myBool is true then the loop is running
     -- We insert a task.wait() to wait 1 second here so it doesn't crash the script and studio.
     task.wait(1) -- Wait for 1 second before run the loop again.
     print('The loop is running')
end
```

### **FOR LOOPS USAGE**

```lua
for i = 10, 0, -1 do
     task.wait(1) -- Wait for 1 second before run the loop again.
     print(i, ' seconds has passed') -- Will print "x seconds has passed"
end
```

#### Loop through a table

```lua
local myTable = {
     myString = 'Hello';
     myBool = false;
     myNumber = 1;
}

for i, v in pairs(myTable) do -- Pairs return both key and value!
   print(i, v) -- This will print "myString & Hello, myBool & false, and myNumber & 1"
end
```

#### Or:

```lua
local myTable = {
     'Hello';
     false;
     1;
}

for i, v in ipairs(myTable) do -- ipairs return only value and key by number instead of it name!
   print(i, v) -- This will print "1 & Hello, 2 & false, and 3 & 1"
end
```

### **REPEAT LOOP USAGE**

```lua
local myBool = false
local secondsHasPassed = 0

repeat task.wait(1) -- Wait for 1 second before running the loop again.
     secondHasPassed += 1
     print('Repeat loop is running')
     if secondsHasPassed >= 5 then -- After 5 seconds set myBool to true to stop the code.
          myBool = true
          secondsHasPassed = 0
     end
until myBool -- Repeat the loop until the boolean is true

print('Repeat loop has stopped')
```

### BREAK USAGE

```lua
local timeHasPassed = 0

while task.wait(1) do
     timeHasPassed += 1 -- Add 1 every second to the variable
     if timeHasPassed >= 3 then -- Break loop after 3 seconds passed.
          print('Three seconds has passed')
          break -- Break the loop to stop it using break
     end
end

print('Hello, World!!') -- This will print "Hello, World!!"
```

### CONTINUE USAGE

```lua
for i = 1, 12, 1 do
     if i % 2 ~= 0 then -- Check if number is divisible by 2. If not then skip to next iteration.
       continue
     end
     print(i, ' is an even number') -- This will output 2, 4, 6, 8...
end
```