restructure code a bit, add comparison functions for primitive types and composed types (needed to put values in sets)

compare/primitives.js

@@ -0,0 +1,29 @@
+import { Char, Double, Int } from "../primitives/types.js";
+
+export const compareNumbers = x => y => {
+  if (typeof(x) !== 'number' || typeof(y) !== 'number') {
+    throw new Error(`was only meant to compare numbers! got ${x} and ${y}`);
+  }
+  return (x < y) ? -1 : (x > y) ? 1 : 0;
+}
+
+export const compareStrings = x => y => {
+  if (typeof(x) !== 'string' || typeof(y) !== 'string') {
+    throw new Error(`was only meant to compare strings! got ${x} and ${y}`);
+  }
+  return (x < y) ? -1 : (x > y) ? 1 : 0;
+}
+
+export const compareBools = x => y => {
+  if (typeof(x) !== 'boolean' || typeof(y) !== 'boolean') {
+    throw new Error(`was only meant to compare booleans! got ${x} and ${y}`);
+  }
+  return x - y;
+};
+
+export const typeToCmp = new Map([
+  [Int, compareNumbers],
+  [Char, compareStrings],
+  [Double, compareNumbers],
+  [Boolean, compareBools],
+]);