Test migration to jest by hand

Apparently using regular expressions is way easier.

test/pullBy/pullBy.js

@@ -0,0 +1,10 @@
+const pullBy = (arr, ...args) => {
+const length = args.length;
+let fn = length > 1 ? args[length - 1] : undefined;
+fn = typeof fn == 'function' ? (args.pop(), fn) : undefined;
+let argState = (Array.isArray(args[0]) ? args[0] : args).map(val => fn(val));
+let pulled = arr.filter((v, i) => !argState.includes(fn(v)));
+arr.length = 0;
+pulled.forEach(v => arr.push(v));
+};
+module.exports = pullBy;