maxBy → sortBy

index.js

@@ -1,10 +1,14 @@
-import { maxBy, path, split, apply, compose } from 'ramda';
+import { split, last, sortBy, path } from 'ramda';
 import camelcase from 'camelcase';
 
-const maxByProp = compose(apply, maxBy, path, split('.'));
+const splitByDot = split('.');
+const maxCamel = camelcase.bind(null, 'max');
 
 export default function maxValues(arr, props) {
   if (!arr || !props) return;
-  props.forEach(prop => { maxByProp(prop)(arr)[camelcase('max', prop)] = true; });
+  props.forEach(prop => {
+    const sortByProp = sortBy(path(splitByDot(prop)));
+    last(sortByProp(arr))[maxCamel(prop)] = true;
+  });
   return arr;
 };

test.js

@@ -1,13 +1,15 @@
 import { equal, deepEqual } from 'assert';
 import maxValues from './index';
 
-const input = [{ name: 'Bob',   age: 25, skills: { crypto: 5  }},
-               { name: 'Alice', age: 14, skills: { crypto: 10 }}]
+const input = [{ name: 'Bob',   age: 25, skills: { crypto: 1  }},
+               { name: 'Some',  age: 14, skills: { crypto: 5 }},
+               { name: 'Alice', age: 7,  skills: { crypto: 10 }}]
 
 it('should maxValues', () =>
   deepEqual(maxValues(input, ['age', 'skills.crypto']),
-    [{ name: 'Bob',   age: 25, skills: { crypto: 5  }, maxAge: true },
-     { name: 'Alice', age: 14, skills: { crypto: 10 }, maxSkillsCrypto: true }]));
+    [{ name: 'Bob',   age: 25, skills: { crypto: 1  }, maxAge: true },
+     { name: 'Some',  age: 14, skills: { crypto: 5 }},
+     { name: 'Alice', age: 7,  skills: { crypto: 10 }, maxSkillsCrypto: true }]));
 
 it('should maxValues invalid input', () =>
   equal(maxValues(), undefined));