feat(nullable): add getWithDefault

Author: glennsl

src/Core__Nullable.mjs

@@ -9,6 +9,14 @@ function fromOption(option) {
 
 }
 
+function getWithDefault(value, $$default) {
+  if (value == null) {
+    return $$default;
+  } else {
+    return value;
+  }
+}
+
 function getExn(value) {
   if (!(value == null)) {
     return value;
@@ -22,6 +30,7 @@ function getExn(value) {
 
 export {
   fromOption ,
+  getWithDefault ,
   getExn ,
 }
 /* No side effect */

src/Core__Nullable.res

@@ -14,6 +14,12 @@ let fromOption: option<'a> => t<'a> = option =>
   | None => undefined
   }
 
+let getWithDefault = (value, default) =>
+  switch value->toOption {
+  | Some(x) => x
+  | None => default
+  }
+
 let getExn: t<'a> => 'a = value =>
   switch value->toOption {
   | Some(x) => x