index.html
<% provide(:title, 12) %>
<!DOCTYPE html>
<html>
<head>
<title><%= yield(:title) %>/ 26 </title>
</head>
<body>
</body>
</html>
provideメソッドでパラメータを引き渡す。
yieldメソッドでパラメータを受け取る。
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