Warning: Undefined array key 1 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 12
Warning: Undefined array key 2 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 15
Warning: Undefined array key 3 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 18
Warning: Undefined array key 4 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 21
Warning: Undefined array key 1 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 24
Warning: Undefined array key 2 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 27
Warning: Undefined array key 3 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 30
Warning: Undefined array key 4 in /home/naoooooo8/naoya-ono.com/public_html/swift/wp-content/themes/sango-theme-poripu/library/functions/prp_content.php on line 33
指定した値が配列の何番目にあるのかチェックする
array.firstIndex(of: value) // valueには検索したい数値や文字列をセットする 以下のように、指定した要素が存在すれば配列の何番目にあるのかを返し、無ければnilを返します。
存在チェックだけしたいのであれば、if文を使って次のように書けばいいですね。
if array.firstIndex(of: value) != nil {
print("配列に指定した値が存在します")
}
