fix(curriculum): throws is not defined

curriculum/challenges/english/08-coding-interview-prep/rosetta-code/define-a-primitive-data-type.english.md

@@ -26,33 +26,33 @@ it should throw a <code>TypeError</code> with an error message of <code>'Not a N
 ```yml
 tests:
   - text: <code>Num</code> should be a function.
-    testString: assert(typeof Num === 'function', '<code>Num</code> should be a function.');
+    testString: assert(typeof Num === 'function');
   - text: <code>new Num(4)</code> should return an object.
-    testString: assert(typeof (new Num(4)) === 'object', '<code>new Num(4)</code> should return an object.');
-  - text: <code>new Num(\'test\')</code> should throw a TypeError with message \'Not a Number\'.
-    testString: assert(throws(() => new Num('test'), TypeError, 'Not a Number'), '<code>new Num(\'test\')</code> should throw a TypeError with message \'Not a Number\'.');
-  - text: <code>new Num(0)</code> should throw a TypeError with message \'Out of range\'.
-    testString: assert(throws(() => new Num(0), TypeError, 'Out of range'), '<code>new Num(0)</code> should throw a TypeError with message \'Out of range\'.');
-  - text: <code>new Num(-5)</code> should throw a TypeError with message \'Out of range\'.
-    testString: assert(throws(() => new Num(-5), TypeError, 'Out of range'), '<code>new Num(-5)</code> should throw a TypeError with message \'Out of range\'.');
-  - text: <code>new Num(10)</code> should throw a TypeError with message \'Out of range\'.
-    testString: assert(throws(() => new Num(11), TypeError, 'Out of range'), '<code>new Num(10)</code> should throw a TypeError with message \'Out of range\'.');
-  - text: <code>new Num(20)</code> should throw a TypeError with message \'Out of range\'.
-    testString: assert(throws(() => new Num(20), TypeError, 'Out of range'), '<code>new Num(20)</code> should throw a TypeError with message \'Out of range\'.');
+    testString: assert(typeof (new Num(4)) === 'object');
+  - text: <code>new Num('test')</code> should throw a TypeError with message 'Not a Number'.
+    testString: assert.throws(() => new Num('test'), TypeError, 'Not a Number');
+  - text: <code>new Num(0)</code> should throw a TypeError with message 'Out of range'.
+    testString: assert.throws(() => new Num(0), TypeError, 'Out of range');
+  - text: <code>new Num(-5)</code> should throw a TypeError with message 'Out of range'.
+    testString: assert.throws(() => new Num(-5), TypeError, 'Out of range');
+  - text: <code>new Num(10)</code> should throw a TypeError with message 'Out of range'.
+    testString: assert.throws(() => new Num(11), TypeError, 'Out of range');
+  - text: <code>new Num(20)</code> should throw a TypeError with message 'Out of range'.
+    testString: assert.throws(() => new Num(20), TypeError, 'Out of range');
   - text: <code>new Num(3) + new Num(4)</code> should equal 7.
-    testString: assert.equal(new Num(3) + new Num(4), 7, '<code>new Num(3) + new Num(4)</code> should equal 7.');
+    testString: assert.equal(new Num(3) + new Num(4), 7);
   - text: <code>new Num(3) - new Num(4)</code> should equal -1.
-    testString: assert.equal(new Num(3) - new Num(4), -1, '<code>new Num(3) - new Num(4)</code> should equal -1.');
+    testString: assert.equal(new Num(3) - new Num(4), -1);
   - text: <code>new Num(3) * new Num(4)</code> should equal 12.
-    testString: assert.equal(new Num(3) * new Num(4), 12, '<code>new Num(3) * new Num(4)</code> should equal 12.');
+    testString: assert.equal(new Num(3) * new Num(4), 12);
   - text: <code>new Num(3) / new Num(4)</code> should equal 0.75.
-    testString: assert.equal(new Num(3) / new Num(4), 0.75, '<code>new Num(3) / new Num(4)</code> should equal 0.75.');
+    testString: assert.equal(new Num(3) / new Num(4), 0.75);
   - text: <code>new Num(3) < new Num(4)</code> should be true.
-    testString: assert(new Num(3) < new Num(4), '<code>new Num(3) < new Num(4)</code> should be true.');
+    testString: assert(new Num(3) < new Num(4));
   - text: <code>new Num(3) > new Num(4)</code> should be false.
-    testString: assert(!(new Num(3) > new Num(4)), '<code>new Num(3) > new Num(4)</code> should be false.');
-  - text: <code>(new Num(5)).toString()</code> should return \'5\'
-    testString: assert.equal((new Num(5)).toString(), '5', '<code>(new Num(5)).toString()</code> should return \'5\'');
+    testString: assert(!(new Num(3) > new Num(4)));
+  - text: <code>(new Num(5)).toString()</code> should return '5'
+    testString: assert.equal((new Num(5)).toString(), '5');
 
 ```
 
@@ -72,46 +72,24 @@ function Num (n) {
 
 </div>
 
-
-
 </section>
 
 ## Solution
 <section id='solution'>
 
-
 ```js
 function Num(n) {
-  const num = Math.floor(n);
-  if (isNaN(num)) {
+  if (isNaN(n)) {
     throw new TypeError('Not a Number');
   }
-  if (num < 1 || num > 10) {
+  if (n < 1 || n > 10) {
     throw new TypeError('Out of range');
   }
 
-  this._value = num;
+  this._value = +n;
 }
 Num.prototype.valueOf = function() { return this._value; };
 Num.prototype.toString = function () { return this._value.toString(); };
-
-function throws(func, errorType, msg) {
-  let hasThrown = false;
-  let errorMsg = '';
-  let correctType = false;
-  try {
-    func();
-  }
-  catch (e) {
-    hasThrown = true;
-    errorMsg = e.message;
-    if (e instanceof errorType) {
-      correctType = true;
-    }
-  }
-  return hasThrown && correctType && msg === errorMsg;
-}
-
 ```
 
 </section>