Make orderBy pure and fix examples

snippets/orderBy.md

@@ -7,7 +7,7 @@ If no orders array is passed it sort by 'asc' by default.
 
 ```js
 const orderBy = (arr, props, orders) =>
-  arr.sort((a, b) =>
+  [...arr].sort((a, b) =>
     props.reduce((acc, prop, i) => {
       if (acc === 0) {
         const [p1, p2] = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]];
@@ -25,6 +25,6 @@ const users = [
   { name: 'fred', age: 40 },
   { name: 'barney', age: 34 }
 ];
-orderby(users, ['name', 'age'], ['asc', 'desc']); // [{name: 'barney', age: 36}, {name: 'barney', age: 34}, {name: 'fred', age: 48}, {name: 'fred', age: 40}]
-orderby(users, ['name', 'age']); // [{name: 'barney', age: 34}, {name: 'barney', age: 36}, {name: 'fred', age: 40}, {name: 'fred', age: 48}]
+orderBy(users, ['name', 'age'], ['asc', 'desc']); // [{name: 'barney', age: 36}, {name: 'barney', age: 34}, {name: 'fred', age: 48}, {name: 'fred', age: 40}]
+orderBy(users, ['name', 'age']); // [{name: 'barney', age: 34}, {name: 'barney', age: 36}, {name: 'fred', age: 40}, {name: 'fred', age: 48}]
 ```