peter.michaux.ca - Lazy Function Definition Pattern
Lazy Function Definition Pattern Published August 11, 2007 in JavaScript This article examines a functional-programming design pattern I've been calling Lazy Function Definition. I've repeatedly found this pattern useful in JavaScript especially when writing cross-browser libraries that are efficient at runtime. Warm-Up Problem Write a function foo that returns a Date object that holds the time th
Practical Functional JavaScript: Code Samples
Practical Functional JavaScript: Code Samples These are the code samples from my Ajax Experience 2008 talk, Practical Functional JavaScript. Click on a line to view (and run) that sample. I've written out some of what I said about the samples in the first section. Check back later, and I'll update the rest.— Oliver Steele, 2 Oct 2008, Amherst, MA 1. Function Objects Callbacks "> Basic callback"> T
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ãªã‚“ã¨ãªãæ€ã„ã¤ãã§ã€ã€ 組ã¿è¾¼ã¿é–¢æ•°ã®String()ã‚„Number()ãªã‚“ã‹ã¯ã€ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã¨ã—ã¦å‘¼ã°ã‚Œã‚‹å ´åˆã¨å˜ãªã‚‹é–¢æ•°ã¨ã—ã¦å‘¼ã°ã‚Œã‚‹å ´åˆã§é•ã†æŒ¯ã‚‹èˆžã„ã«ãªã‚‹ã‘ã©ã€å®Ÿéš›ãã„ã†ã£ãŸé–¢æ•°ã‚’作るã«ã¯ã©ã†ã—ãŸã‚‰ã„ã„ã‚“ã ã‚ã†ã¨è€ƒãˆã¦ã¿ã¾ã—ãŸã€‚ ã§ã€æ€ã„ã¤ã„ãŸã®ã¯ã€ä¸‹è¨˜ã®ã‚ˆã†ã«thisãŒä½•ã‹ã§åˆ¤æ–ã™ã‚‹æ–¹æ³•ã ã‘ã§ã—ãŸã€‚ function Hoge() { if (this instanceof Hoge) { print('constructor'); } else { print('function'); } } Hoge(); //=>function new Hoge(); //=>constructor thisã‚’ãã®ã‚ªãƒ–ジェクトã«ã—ã¦é–¢æ•°ã¨ã—ã¦å‘¼ã³å‡ºã›ã‚‹æ–¹æ³•ã‚‚ã‚ã‚‹(apply使ã†ã‹ã€Hogeオブジェクトã®ãƒ—ãƒãƒ‘ティã«Hoge関数を代入ã—ã¦å‘¼ã³å‡ºã—)ã®ã§ã€åŽ³å¯†ã«ã¯åˆ¤å®šã§ããªãã†ã§ã™ãŒã€ã¾
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