3 files changed, 66 insertions, 34 deletions
diff --git a/src/gleam/float.gleam b/src/gleam/float.gleam
index 857b593..b3f0df2 100644
--- a/src/gleam/float.gleam
+++ b/src/gleam/float.gleam
@@ -2,20 +2,33 @@ import gleam/order.{Order}
 
 if erlang {
   import gleam/string_builder
+}
 
-  /// Attempts to parse a string as a float, returning `Error(Nil)` if it was not
-  /// possible.
-  ///
-  /// ## Examples
-  ///    > parse("2.3")
-  ///    Ok(2.3)
-  ///
-  ///    > parse("ABC")
-  ///    Error(Nil)
-  ///
-  pub external fn parse(String) -> Result(Float, Nil) =
+/// Attempts to parse a string as a float, returning `Error(Nil)` if it was not
+/// possible.
+///
+/// ## Examples
+///    > parse("2.3")
+///    Ok(2.3)
+///
+///    > parse("ABC")
+///    Error(Nil)
+///
+pub fn parse(string: String) -> Result(Float, Nil) {
+  do_parse(string)
+}
+
+if erlang {
+  external fn do_parse(String) -> Result(Float, Nil) =
     "gleam_stdlib" "parse_float"
+}
+
+if javascript {
+  external fn do_parse(String) -> Result(Float, Nil) =
+    "../gleam_stdlib.js" "parse_float"
+}
 
+if erlang {
   /// Returns the string representation of the provided float.
   ///
   /// ## Examples
diff --git a/src/gleam_stdlib.js b/src/gleam_stdlib.js
index 1e93901..a60b361 100644
--- a/src/gleam_stdlib.js
+++ b/src/gleam_stdlib.js
@@ -22,7 +22,15 @@ export function identity(x) {
 
 export function parse_int(value) {
   if (/^[-+]?(\d+)$/.test(value)) {
-    return gleam_ok(Number(value));
+    return gleam_ok(parseInt(value));
+  } else {
+    return gleam_error(Nil);
+  }
+}
+
+export function parse_float(value) {
+  if (/^[-+]?(\d+)\.(\d+)$/.test(value)) {
+    return gleam_ok(parseFloat(value));
   } else {
     return gleam_error(Nil);
   }
diff --git a/test/gleam/float_test.gleam b/test/gleam/float_test.gleam
index 79dba56..774f448 100644
--- a/test/gleam/float_test.gleam
+++ b/test/gleam/float_test.gleam
@@ -1,34 +1,45 @@
+import gleam/should
+import gleam/float
+
 if erlang {
-  import gleam/should
-  import gleam/float
   import gleam/order
+}
 
-  pub fn parse_test() {
-    "1.23"
-    |> float.parse
-    |> should.equal(Ok(1.23))
+pub fn parse_test() {
+  "1.23"
+  |> float.parse
+  |> should.equal(Ok(1.23))
 
-    "5.0"
-    |> float.parse
-    |> should.equal(Ok(5.0))
+  "+1.23"
+  |> float.parse
+  |> should.equal(Ok(1.23))
 
-    "0.123456789"
-    |> float.parse
-    |> should.equal(Ok(0.123456789))
+  "-1.23"
+  |> float.parse
+  |> should.equal(Ok(1.23))
 
-    ""
-    |> float.parse
-    |> should.equal(Error(Nil))
+  "5.0"
+  |> float.parse
+  |> should.equal(Ok(5.0))
 
-    "what"
-    |> float.parse
-    |> should.equal(Error(Nil))
+  "0.123456789"
+  |> float.parse
+  |> should.equal(Ok(0.123456789))
 
-    "1"
-    |> float.parse
-    |> should.equal(Error(Nil))
-  }
+  ""
+  |> float.parse
+  |> should.equal(Error(Nil))
+
+  "what"
+  |> float.parse
+  |> should.equal(Error(Nil))
 
+  "1"
+  |> float.parse
+  |> should.equal(Error(Nil))
+}
+
+if erlang {
   pub fn to_string_test() {
     123.0
     |> float.to_string