karasuyamatengu https://blog.hatena.ne.jp/karasuyamatengu/ karasuyamatenguの日記 https://karasuyamatengu.hatenadiary.org/ if-letとwhen-letという便利なマクロの解説 http://blog.jayfields.com/2011/03/clojure-if-let-and-when-let.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+jayfields/mjKQ+(Jay+Fields+Thoughts) (if-let [a ] ) が真ならその値をaにバインドして、を評価する。が偽ならを返す。例 user=> (if-let [a 4] (+ a 4) (+ 10 10)) 8 when-let if-letと似ているが… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkarasuyamatengu.hatenadiary.org%2Fentry%2F20110304%2F1299219724" title="clojureの便利なif-let - karasuyamatenguの日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2011-03-04 15:22:04 rich https://karasuyamatengu.hatenadiary.org/entry/20110304/1299219724 1.0 100%