From 5d3961fc0cdbc0161c02b296a2f9d9f910253f14 Mon Sep 17 00:00:00 2001
From: yko-git <yko.iwata@gmail.com>
Date: Sat, 16 Mar 2024 14:14:46 +0900
Subject: [PATCH] =?UTF-8?q?fix=20002=5Fmedium=20isPrime=20(for=E3=81=A7?=
 =?UTF-8?q?=E6=9B=B8=E3=81=8D=E7=9B=B4=E3=81=97)?=
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---
 003_practice/002_medium.js | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/003_practice/002_medium.js b/003_practice/002_medium.js
index d1a77ae..c75df76 100644
--- a/003_practice/002_medium.js
+++ b/003_practice/002_medium.js
@@ -103,15 +103,12 @@ function isPalindrome(str) {
  *
  */
 function isPrime(num) {
-  //numが2桁以上の場合
-  if (num.length >= 2) {
-    num = Array.from(String(num), Number);
-    for (let i = 0; i < num.length; i++) {
-      num = num[i] + num[i + 1];
-    }
+  //numが2の場合
+  if (num === 1) {
+    return false;
   }
-  for (let i = 0; i <= num; i++) {
-    if (num % i === 0 || num === 1 || num === 2) {
+  for (let i = 2; i < num; i++) {
+    if (num % i === 0) {
       return false;
     }
   }