In Lua, you can make all the characters of a string upper case via the **`string.upper()` function**.

# 
#  Syntax

---
```lua
string.upper(str)
```
---

# 
#  Parameters

- **`str`**: The function needs a string as a mandatory parameter.

##
## Return value

- The function will return the string with each character as upper case.

##
## Code


us = string.upper("Hello, Educative!")
print(us)

# 
## Output

---
```
HELLO, EDUCATIVE!
```

What is string.upper in Lua?

Converts all characters in a string to uppercase using string.upper().