January 2014
Intermediate to advanced
352 pages
6h 34m
Japanese
Content preview from JavaScriptで学ぶ関数型プログラミング
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
176
6 章 再帰
function influencedWithStrategy(strategy, lang, graph) {
var results = [];
strategy(function(x) {
if (_.isArray(x) && _.first(x) === lang)
results.push(second(x));
return x;
}, graph);
return results;
}
influencedWithStrategy
関数は、引数に与えられた深さ優先探索関数でグラフを探
索し、指定した言語に影響を及ぼされた言語の配列を生成します。
influencedWithStrategy(postDepth, "Lisp", influences);
//=> ["Smalltalk", "Scheme"]
結果を構築するために、与えられた配列の内容を変更していますが、
influenced
WithStrategy
関数の内部のみでの操作に限定されており、元の配列に対する作用はあ
りません。
6.2
再帰多すぎ！（トランポリンとジェネレータ）
本章で末尾再帰を紹介しましたが、現在の
JavaScript
エンジンは、たとえ最適化
を行えるような状況であっても、再帰呼び出しの最適化は行いません。したがって、
再帰関数を記述する際には次のようなエラーに出会うことがあります。
evenSteven(100000);
//
多すぎる再帰（もしくはそれに起因するエラー）
このようなエラー（ ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.