Added equals.md and tests

test/equals/equals.js

@@ -0,0 +1,13 @@
+module.exports = equals = (a, b) => {
+if (a === b) return true;
+if (a instanceof Date && b instanceof Date)
+return a.getTime() === b.getTime();
+if (!a || !b || (typeof a != 'object' && typeof b !== 'object'))
+return a == b;
+if (a === null || a === undefined || b === null || b === undefined)
+return false;
+if (a.prototype !== b.prototype) return false;
+let keys = Object.keys(a);
+if (keys.length !== Object.keys(b).length) return false;
+return keys.every(k => equals(a[k], b[k]));
+};