JS dynamic bool

2 files changed, 30 insertions, 13 deletions

diff --git a/src/gleam/dynamic.gleam b/src/gleam/dynamic.gleam
index d4afca0..86d1b6e 100644
--- a/src/gleam/dynamic.gleam
+++ b/src/gleam/dynamic.gleam
@@ -159,21 +159,32 @@ if javascript {
     "../gleam_stdlib.js" "decode_float"
 }
 
+/// Checks to see whether a Dynamic value is an bool, and return the bool if
+/// it is.
+///
+/// ## Examples
+///
+///    > bool(from(True))
+///    Ok(True)
+///
+///    > bool(from(123))
+///    Error(DecodeError(expected: "bool", found: "Int"))
+///
+pub fn bool(from data: Dynamic) -> Result(Bool, DecodeError) {
+  decode_bool(data)
+}
+
 if erlang {
-  /// Checks to see whether a Dynamic value is an bool, and return the bool if
-  /// it is.
-  ///
-  /// ## Examples
-  ///
-  ///    > bool(from(True))
-  ///    Ok(True)
-  ///
-  ///    > bool(from(123))
-  ///    Error(DecodeError(expected: "bool", found: "Int"))
-  ///
-  pub external fn bool(from: Dynamic) -> Result(Bool, DecodeError) =
+  external fn decode_bool(Dynamic) -> Result(Bool, DecodeError) =
     "gleam_stdlib" "decode_bool"
+}
 
+if javascript {
+  external fn decode_bool(Dynamic) -> Result(Bool, DecodeError) =
+    "../gleam_stdlib.js" "decode_bool"
+}
+
+if erlang {
   /// Checks to see whether a Dynamic value is a list, and return the list if it
   /// is.
   ///
diff --git a/src/gleam_stdlib.js b/src/gleam_stdlib.js
index cfe26a2..b8feecf 100644
--- a/src/gleam_stdlib.js
+++ b/src/gleam_stdlib.js
@@ -476,8 +476,11 @@ function classify_dynamic(data) {
     return "List";
   } else if (Number.isInteger(data)) {
     return "Int";
+  } else if (typeof data === "number") {
+    return "Float";
   } else {
-    return typeof data;
+    let type = typeof data;
+    return type.charAt(0).toUpperCase() + type.slice(1);
   }
 }
 
@@ -498,3 +501,6 @@ export function decode_int(data) {
 export function decode_float(data) {
   return typeof data === "number" ? new Ok(data) : decoder_error("Float", data);
 }
+export function decode_bool(data) {
+  return typeof data === "boolean" ? new Ok(data) : decoder_error("Bool", data);
+}