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js 回文の真偽判定

Last updated at Posted at 2016-12-12

##文章が回文かどうか真偽判定する

script.js
function palindrome(str) {
 //write your code.
}
palindrome("My age is 0, 0 si ega ym.")//true

出力結果 例

script.js
palindrome("eye") //true
palindrome("_eye") // true
palindrome("My age is 0, 0 si ega ym.")//true
palindrome("0_0 (: /-\ :) 0-0")//true
palindrome("1 eye for of 1 eye.") //false

##試したコード

script.js
function palindrome(str) {
 var i =str.replace(/[\W_]/g, '').toLowerCase();
 return i === i.split('').reverse().join('');
}

##考え方
.replace(/[\W_]/g, '')で英数字以外の記号を取り除く
.toLowerCase()で小文字に変換して変数iに格納する。
split('').reverse().join('')で分割、逆順、結合をして変数iと比較する。

もっと簡潔に美しくかけるよ!という方、コメントお待ちしております。

##参考リンク
String.prototype.replace()
String.prototype.toLowerCase()

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