From 7956deb46e32830ab54f713040e6151de4a5ab9a Mon Sep 17 00:00:00 2001
From: Noritaka Kobayashi <arukimedesu1166777@gmail.com>
Date: Sun, 21 Sep 2025 13:14:09 +0900
Subject: [PATCH] refactor: replace if-then-else flow by a single return
 statement

---
 src/lib/isBase32.js       |  6 +-----
 src/lib/isBase58.js       |  5 +----
 src/lib/isIBAN.js         |  6 +-----
 src/lib/isIdentityCard.js | 12 ++----------
 4 files changed, 5 insertions(+), 24 deletions(-)

diff --git a/src/lib/isBase32.js b/src/lib/isBase32.js
index 5e2969cbc..81d30c9f5 100644
--- a/src/lib/isBase32.js
+++ b/src/lib/isBase32.js
@@ -16,9 +16,5 @@ export default function isBase32(str, options) {
     return crockfordBase32.test(str);
   }
 
-  const len = str.length;
-  if (len % 8 === 0 && base32.test(str)) {
-    return true;
-  }
-  return false;
+  return str.length % 8 === 0 && base32.test(str);
 }
diff --git a/src/lib/isBase58.js b/src/lib/isBase58.js
index 05c46dc18..f974d70d0 100644
--- a/src/lib/isBase58.js
+++ b/src/lib/isBase58.js
@@ -5,8 +5,5 @@ const base58Reg = /^[A-HJ-NP-Za-km-z1-9]*$/;
 
 export default function isBase58(str) {
   assertString(str);
-  if (base58Reg.test(str)) {
-    return true;
-  }
-  return false;
+  return base58Reg.test(str);
 }
diff --git a/src/lib/isIBAN.js b/src/lib/isIBAN.js
index ed0abd6c0..affd7a097 100644
--- a/src/lib/isIBAN.js
+++ b/src/lib/isIBAN.js
@@ -101,11 +101,7 @@ function hasOnlyValidCountryCodes(countryCodeArray) {
   const countryCodeArrayFilteredWithObjectIbanCode = countryCodeArray
     .filter(countryCode => !(countryCode in ibanRegexThroughCountryCode));
 
-  if (countryCodeArrayFilteredWithObjectIbanCode.length > 0) {
-    return false;
-  }
-
-  return true;
+  return countryCodeArrayFilteredWithObjectIbanCode.length === 0;
 }
 
 /**
diff --git a/src/lib/isIdentityCard.js b/src/lib/isIdentityCard.js
index fc37d4a29..7e20064e1 100644
--- a/src/lib/isIdentityCard.js
+++ b/src/lib/isIdentityCard.js
@@ -217,11 +217,7 @@ const validators = {
     // sanitize user input
     const sanitized = str.trim();
 
-    // validate the data structure
-    if (!NIN.test(sanitized)) {
-      return false;
-    }
-    return true;
+    return NIN.test(sanitized);
   },
   'ar-TN': (str) => {
     const DNI = /^\d{8}$/;
@@ -229,11 +225,7 @@ const validators = {
     // sanitize user input
     const sanitized = str.trim();
 
-    // validate the data structure
-    if (!DNI.test(sanitized)) {
-      return false;
-    }
-    return true;
+    return DNI.test(sanitized);
   },
   'zh-CN': (str) => {
     const provincesAndCities = [