Haskell filter function laziness -


दिए गए: 

  ले 5 (फ़िल्टर पी एक्सएस)   
 कहते हैं कि अगर  फ़िल्टर पी xs  1K मैच लौटाएगा, क्या हास्केल केवल 5 मैचों को फ़िल्टर कर देगा और बड़े इंटरमीडिएट परिणाम के बिना उत्पादन करेगा?   
 
 
 यह 5 कोड का उपयोग करने के लिए केवल  xs  को स्कैन करेगा, केवल इस उपसर्ग पर  p  का मूल्यांकन करेगा  xs ।  
 अधिक सटीक होने के लिए, यह वास्तव में कम गणना करता है, परिणाम के आधार पर इसका उपयोग कैसे किया जाता है। उदाहरण के लिए,  
  मुख्य = दो पी एक्स = (एक्स == 3) || (X> = 1000000) list1 = [0..1000000000] list2 = take5 (फ़िल्टर पी सूची 1) प्रिंट (सिर list2)   
 केवल  list1  स्कैन करेगा जब तक  3  पाया जाता है, और तब तक नहीं, जबकि  ले लो  पांच तत्वों के लिए पूछ रहा है इसका कारण यह है कि  head  इन पांचों में से केवल पहले की मांग कर रहा है, इसलिए आलस्य केवल इसका मूल्यांकन करने का कारण बनता है।

Comments

Post a Comment

Popular posts from this blog

How can I add a seperate action listener to all 14 of my buttons at once that can determine player turn?(java) -

I have a big code, for a game I'm calling Tommy's Kumamak. I know that this is not beautiful, but I am very naive and for some reasons I know from using arrays, anyway, my problem is that I can not add a variable outside the listener and within the action listener I can modify the variable (pTurn ++) from How can I go about adding a count to that variable from inside the action listener? 1 error was found: file: c: \ user \ public \ togiz_kumalak.java [line: 130] error: local variables pTurn is accessed from within internal class; Need to be declared final int pTurn = 0; Button1.addActionListener {new zero-action action (action event e) {pTurn ++; if (pTurn% 2 == 0) {display.append ("\ n Player 2 cup 1");} If ( PTurn% 2! = 0) {display.append ("\ nPlayer 1Cup 1")}}); In that case, move the contents of the functionalities into orbit and then call the action For example, display the method from: Private Zero Button Press {pTurn ++; If (pTurn% 2...
Read more

php - Sorting an multidimension array using usort fails -

I tried to use custom-made YouTube fun cats when I ran 5 cell arrays in 30 seconds and then a Throwing a serious error. I tried to know that I have been made an infinite loop, but he did not install it. iPhone 5S 32GB [Price] => 0 [Description] => A new apple product [Image_URL] = & Gt; [Business_ID] = & gt; 6 [keyword] = & gt; ["iPhone", "iPhone 5s", "Apple", "32 GB"]) [1] = & gt; array ([name] = & Gt; iPhone 4S 32g [Price] => 300 [Description] => Apple iPhone 4S = [Image_URL] => [Business_ID] => 6 [Keyword] = & gt; [ "IPhone 4S", "" iPhone "," Apple "," 32 GB "])) search: $ searchTerm =" iphone 5s "; Code: if (! SearchTerm below!) {$ SearchTermWords = Explosion (" ", $ searchTerm); $$ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ ['Keyword']; $ bKeywords = $...
Read more

Simple file compression in C -

I am new to programming with C, and I need elsewhere that I can read on file compression in C I am I only need a simple accredited method, for example it will help but mostly I can read it to understand. Probably a good starting point RLE is very simple but it is not so insignificant to apply see it :
Read more