:sparkes: Creates the factorial route

higorpo · higorpo · commit 81e25f1c6bcd · 2020-09-14T13:36:01.000-03:00
diff --git a/src/controllers/Factorial/index.ts b/src/controllers/Factorial/index.ts
@@ -1,5 +1,6 @@
 import { Request, Response } from 'express';
 import { validationResult } from 'express-validator';
+import calcFactorial from '../../utils/calcFactorial';
 
 class FactorialController {
     compute(request: Request, response: Response) {
@@ -9,7 +10,8 @@ class FactorialController {
             return response.status(400).json({ errors: errors.array() });
         }
 
-        return response.send("ok, it's working!");
+        const result = calcFactorial(request.query.number).toString();
+        return response.json({ result });
     }
 }
 
diff --git a/src/routes.ts b/src/routes.ts
@@ -8,7 +8,10 @@ const route = Router();
 const factorialController = new FactorialController();
 
 route.get('/factorial', [
-    query('number').isNumeric().withMessage('Você precisa fornecer um número')
+    query('number')
+        .isNumeric()
+        .withMessage('Você precisa fornecer um número')
+        .toInt()
 ], factorialController.compute);
 
 export default route;
diff --git a/src/utils/calcFactorial.ts b/src/utils/calcFactorial.ts
@@ -0,0 +1,8 @@
+export default (n: any) => {
+    var i, result = BigInt(1);
+
+    for (i = BigInt(2); i <= n; i++) {
+        result *= i;
+    }
+    return result;
+}

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,6 @@`
`1`	`1`	`import { Request, Response } from 'express';`
`2`	`2`	`import { validationResult } from 'express-validator';`
	`3`	`+import calcFactorial from '../../utils/calcFactorial';`
`3`	`4`
`4`	`5`	`class FactorialController {`
`5`	`6`	`compute(request: Request, response: Response) {`
`@@ -9,7 +10,8 @@ class FactorialController {`
`9`	`10`	`return response.status(400).json({ errors: errors.array() });`
`10`	`11`	`}`
`11`	`12`
`12`		`- return response.send("ok, it's working!");`
	`13`	`+ const result = calcFactorial(request.query.number).toString();`
	`14`	`+ return response.json({ result });`
`13`	`15`	`}`
`14`	`16`	`}`
`15`	`17`