Variables and Types

Let Bindings

In Gleam, you create variables with let:

let name = "Gleam"
let age = 1
let pi = 3.14
let is_fun = True

All variables in Gleam are immutable. Once you bind a value to a name, it cannot be changed. You can, however, rebind a name to a new value:

let x = 1
let x = x + 1  // This creates a new binding, x is now 2

Basic Types

Gleam has these fundamental types:

Type Annotations

Gleam can infer types, but you can add annotations for clarity:

let name: String = "Gleam"
let age: Int = 1

Int and Float Are Separate

Gleam strictly separates integers and floats. You cannot mix them in arithmetic:

let x = 1 + 2      // Int arithmetic: +, -, *, /, %
let y = 1.0 +. 2.0  // Float arithmetic: +., -., *., /.

The . suffix on operators indicates float operations. This is different from most languages but prevents subtle precision bugs.

Converting Between Types

Use int.to_string and float.to_string to convert numbers to strings:

import gleam/int
import gleam/float

let age_str = int.to_string(42)       // "42"
let pi_str = float.to_string(3.14)    // "3.14"

Your Task

Create variables for your name and your favorite number. Print them on separate lines in the format:

Name: Lucy
Number: 7