Fix int.power and float.power functions (#302)

1 files changed, 8 insertions, 2 deletions

diff --git a/src/gleam_stdlib.mjs b/src/gleam_stdlib.mjs
index 97fa491..b4f3d22 100644
--- a/src/gleam_stdlib.mjs
+++ b/src/gleam_stdlib.mjs
@@ -210,7 +210,7 @@ export function bit_string_to_string(bit_string) {
     let decoder = new TextDecoder("utf-8", { fatal: true });
     return new Ok(decoder.decode(bit_string.buffer));
   } catch (_error) {
-    return new Error(undefined);
+    return new Error(Nil);
   }
 }
 
@@ -239,7 +239,13 @@ export function truncate(float) {
 }
 
 export function power(base, exponent) {
-  return Math.pow(base, exponent);
+  // It is checked in Gleam that:
+  // - The base is non-negative and that the exponent is not fractional.
+  // - The base is not zero and the exponent is not negative (otherwise 
+  //   the result will essentially be divion by zero). 
+  // It can thus be assumed that valid input is passed to the Math.pow
+  // function and a NaN or Infinity value will not be produced.
+  return Math.pow(base, exponent)
 }
 
 export function random_uniform() {