reorganize directory and file structure

lib/compare/primitives.js

@@ -0,0 +1,28 @@
+// Total ordering of primitive types
+
+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;
+};
+
+// The Unit-type has only one instance, which is equal to itself:
+export const compareUnits = _ => _ => 0;
+
+// Symbols are encoded as strings
+export const compareSymbols = a => b => compareStrings(a)(b);