Strings

String Basics

Strings in Gleam are UTF-8 encoded and immutable. They are created with double quotes:

let greeting = "Hello, World!"

Concatenation with <>

The <> operator joins strings together:

let first = "Hello"
let second = "World"
let result = first <> ", " <> second <> "!"
// "Hello, World!"

This is different from most languages which use + for string concatenation. The <> operator only works on strings -- you cannot accidentally concatenate a number with a string.

The String Module

The gleam/string module provides functions for working with strings:

import gleam/string

string.length("hello")           // 5
string.uppercase("hello")        // "HELLO"
string.lowercase("HELLO")        // "hello"
string.reverse("hello")          // "olleh"
string.contains("hello", "ell")  // True
string.replace("hello", "l", "r") // "herro"
string.trim("  hello  ")         // "hello"

String Splitting and Joining

string.split("a,b,c", ",")       // ["a", "b", "c"]
string.join(["a", "b", "c"], "-") // "a-b-c"

Inspecting Values

The string.inspect function converts any value to a debug string representation:

string.inspect(42)     // "42"
string.inspect(True)   // "True"
string.inspect([1, 2]) // "[1, 2]"

Your Task

Write a function called shout that takes a string and returns it in uppercase with an exclamation mark at the end. Use it in main to shout "hello" and "gleam" on separate lines.