fix(curriculum): getUserInput is not defined

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/write-concise-declarative-functions-with-es6.english.md

@@ -23,9 +23,9 @@ Refactor the function <code>setGear</code> inside the object <code>bicycle</code
 ```yml
 tests:
   - text: Traditional function expression was not used.
-    testString: assert(!getUserInput('index').match(/function/),'Traditional <code>function</code> expression was not used.');
+    testString: getUserInput => assert(!getUserInput('index').match(/function/),'Traditional <code>function</code> expression was not used.');
   - text: <code>setGear</code> is a declarative function.
-    testString: assert(typeof bicycle.setGear === 'function' && getUserInput('index').match(/setGear\s*\(.+\)\s*\{/), '<code>setGear</code> is a declarative function.');
+    testString: getUserInput => assert(typeof bicycle.setGear === 'function' && getUserInput('index').match(/setGear\s*\(.+\)\s*\{/), '<code>setGear</code> is a declarative function.');
   - text: <code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.
     testString: assert((new bicycle.setGear(48)).gear === 48, '<code>bicycle.setGear(48)</code> changes the <code>gear</code> value to 48.');
 
@@ -43,7 +43,6 @@ tests:
 const bicycle = {
   gear: 2,
   setGear: function(newGear) {
-    "use strict";
     this.gear = newGear;
   }
 };
@@ -54,14 +53,19 @@ console.log(bicycle.gear);
 
 </div>
 
-
-
 </section>
 
 ## Solution
 <section id='solution'>
 
 ```js
-// solution required
+const bicycle = {
+  gear: 2,
+  setGear(newGear) {
+    this.gear = newGear;
+  }
+};
+bicycle.setGear(3);
 ```
+
 </section>