Add to_float function for int module

3 files changed, 31 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b45b807..c9c9dfe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - The `int` and `float` modules gain the `negate` function.
 - The `result` module gains the `all` function.
 - The `dynamic` module gains the `option` function.
+- The `int` module gains the `to_float` function.
 
 ## v0.11.0 - 2020-08-22
 
diff --git a/src/gleam/int.gleam b/src/gleam/int.gleam
index 2dc4f46..f717eaa 100644
--- a/src/gleam/int.gleam
+++ b/src/gleam/int.gleam
@@ -42,6 +42,22 @@ pub external fn to_string(Int) -> String =
 pub external fn to_base_string(Int, Int) -> String =
   "erlang" "integer_to_binary"
 
+/// Takes an int and returns its value as a float
+///
+/// ## Examples
+///
+///   > to_float(5)
+///   5.
+///
+///   > to_float(0)
+///   0.
+///
+///   > to_float(-3)
+///   -3.
+///
+pub external fn to_float(a: Int) -> Float =
+  "erlang" "float"
+
 /// Compares two ints, returning an order.
 ///
 /// ## Examples
diff --git a/test/gleam/int_test.gleam b/test/gleam/int_test.gleam
index 4a01073..97fbb84 100644
--- a/test/gleam/int_test.gleam
+++ b/test/gleam/int_test.gleam
@@ -52,6 +52,20 @@ pub fn to_base_string_test() {
   |> should.equal("-64")
 }
 
+pub fn to_float_test() {
+  int.to_float(1)
+  |> should.equal(1.)
+
+  int.to_float(5)
+  |> should.equal(5.)
+
+  int.to_float(0)
+  |> should.equal(0.)
+
+  int.to_float(-5)
+  |> should.equal(-5.)
+}
+
 pub fn compare_test() {
   int.compare(0, 0)
   |> should.equal(order.Eq)