diff --git a/src/utils/number.ts b/src/utils/number.ts
index 596d1f1..fcd1623 100644
--- a/src/utils/number.ts
+++ b/src/utils/number.ts
@@ -1,3 +1,7 @@
 export const isNumber = (value: string) => {
   return !isNaN(Number(value));
 };
+
+export const isPairingCode = (pairingCode: string) => {
+  return pairingCode.length === 8 && pairingCode.split('').every((char) => isNumber(char));
+};
diff --git a/src/yargs.ts b/src/yargs.ts
index c460c84..c3bbd07 100644
--- a/src/yargs.ts
+++ b/src/yargs.ts
@@ -2,7 +2,7 @@ import yargs from 'yargs/yargs';
 import { CATEGORIES } from './config/categories';
 import { OUTPUT_FORMATS } from './config/output';
 import { Category, OutputFormat } from './types';
-import { isNumber } from './utils/number';
+import { isPairingCode } from './utils/number';
 
 export const argv = yargs(process.argv.slice(2))
   // Attempt to detect the os locale
@@ -92,11 +92,10 @@ export const argv = yargs(process.argv.slice(2))
       );
   })
   .check(({ pairingCode }) => {
-    if (pairingCode.length === 8 && pairingCode.split('').every((char) => isNumber(char))) {
+    if (isPairingCode(pairingCode)) {
       return true;
-    } else {
-      throw new Error('Pairing Code must be specified with 8 digits');
     }
+    throw new Error('Pairing Code must be specified with 8 digits');
   })
   .help()
   .usage('Usage: homekit-code [commands] [options]')