{"id":11252,"date":"2015-11-13T17:41:45","date_gmt":"2015-11-13T22:41:45","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/?p=11252"},"modified":"2015-11-11T01:47:07","modified_gmt":"2015-11-11T06:47:07","slug":"node-js-callbacks-concept-callback-%e0%a6%95%e0%a6%bf","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=11252","title":{"rendered":"Node.js &#8211; \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u098f\u09b0 \u09a7\u09be\u09b0\u09a3\u09be\u0964 \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u0995\u09bf? (Callbacks Concept)"},"content":{"rendered":"<p><strong>\u09ae\u09cb\u09b9\u09be\u09ae\u09cd\u09ae\u09a6 \u0986\u09ac\u09cd\u09a6\u09c1\u09b2\u09cd\u09b2\u09be\u09b9<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h2>Callback \u0995\u09bf ?<\/h2>\n<p style=\"text-align: justify;\">Callback \u098f\u0995\u099f\u09bf \u09ab\u09be\u0982\u09b6\u09a8\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u098f\u0995\u099f\u09bf asynchronous \u09b8\u09ae\u09a4\u09c2\u09b2\u09cd\u09af \u0964 \u098f\u0995\u099f\u09bf \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u09ab\u09be\u0982\u09b6\u09a8 \u098f\u0995\u099f\u09bf \u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u0995\u09be\u099c\u09c7\u09b0 \u09b6\u09c7\u09b7\u09c7 \u09b8\u09be\u09a7\u09be\u09b0\u09a8\u09a4 \u0995\u09b2 \u0995\u09b0\u09be \u09b9\u09df\u09c7 \u09a5\u09be\u0995\u09c7 \u0964 Node.js \u098f callback \u09ab\u09be\u0982\u09b6\u09a8 \u09aa\u09cd\u09b0\u099a\u09c1\u09b0 \u09aa\u09b0\u09bf\u09ae\u09be\u09a8\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u09b9\u09df\u09c7 \u09a5\u09be\u0995\u09c7 \u0964 Node.js \u098f\u09b0 \u09b8\u0995\u09b2 API \u0997\u09c1\u09b2\u09bf \u098f\u09ae\u09a8\u09be\u09ad\u09be\u09ac\u09c7 \u09a4\u09c8\u09b0\u09c0 \u0995\u09b0\u09be \u09b9\u09df\u09c7\u099b\u09c7 \u09af\u09be\u09a4\u09c7 \u0995\u09b0\u09c7 \u09a4\u09be\u09b0\u09be callbacks \u09b8\u09ae\u09b0\u09cd\u09a5\u09a8 \u0995\u09b0\u09c7 \u0964<\/p>\n<p style=\"text-align: justify;\">\u0989\u09a6\u09be\u09b9\u09b0\u09a3\u09b8\u09cd\u09ac\u09b0\u09c2\u09aa, \u098f\u0995\u099f\u09bf \u09ab\u09be\u0987\u09b2 \u09aa\u09a1\u09bc\u09be\u09b0 \u09ab\u09be\u0982\u09b6\u09a8 \u09ab\u09be\u0987\u09b2 \u09aa\u09a1\u09bc\u09be\u09b0 \u09aa\u09b0 \u0986\u09ac\u09be\u09b0 \u0986\u0997\u09c7\u09b0 \u099c\u09be\u09df\u0997\u09be\u09df \u09ab\u09bf\u09b0\u09c7 \u0986\u09b8\u09c7 \u09af\u09be\u09a4\u09c7 \u0995\u09b0\u09c7 \u09aa\u09b0\u09ac\u09b0\u09cd\u09a4\u09c0 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6 execute \u0995\u09b0\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7 \u0964 \u09ab\u09be\u0987\u09b2\u099f\u09bf \u09aa\u09dc\u09be\u09b0 \u09aa\u09b0 \u09ab\u09be\u0987\u09b2\u09c7\u09b0 \u0995\u09a8\u09cd\u099f\u09c7\u09a8\u09cd\u099f \u09aa\u09cd\u09af\u09be\u09b0\u09be\u09ae\u09bf\u099f\u09be\u09b0 \u09b9\u09bf\u09b8\u09c7\u09ac\u09c7 callback \u09ab\u09be\u0982\u09b6\u09a8 \u098f \u0986\u09b8\u09ac\u09c7 \u0964 \u098f\u0987 \u0995\u09be\u09b0\u09a8\u09c7\u0987 Node.js \u098f\u09a4 \u099c\u09a8\u09aa\u09cd\u09b0\u09bf\u09df \u0995\u09be\u09b0\u09a8 \u098f\u099f\u09bf \u0995\u09cb\u09a8 \u09a7\u09b0\u09a8\u09c7\u09b0 \u09ab\u09be\u0982\u09b6\u09a8 call \u099b\u09be\u09dc\u09be\u0987 \u0985\u09a8\u09c7\u0995 request \u09aa\u09cd\u09b0\u0995\u09cd\u09b0\u09bf\u09df\u09be \u0995\u09b0\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7 \u0964<\/p>\n<p>&nbsp;<\/p>\n<h2>\u0989\u09a6\u09be\u09b9\u09b0\u09a3 (Blocking Code)<\/h2>\n<p>input.txt \u09a8\u09be\u09ae\u09c7 \u098f\u0995\u099f\u09bf \u09ab\u09be\u0987\u09b2 \u09a4\u09c8\u09b0\u09c0 \u0995\u09b0\u09c1\u09a8 \u098f\u09ac\u0982 \u09a4\u09be\u09a4\u09c7 \u09a8\u09bf\u09ae\u09cd\u09a8\u09c7\u09b0 text \u099f\u09bf copy\/paste \u0995\u09b0\u09c7 \u09a6\u09bf\u09a8 \u0964<\/p>\n<hr \/>\n<p>Tutorials Point is giving self learning content<br \/>\nto teach the world in simple and easy way!!!!!<\/p>\n<hr \/>\n<p>\u098f\u0995\u099f\u09bf javascript (main.js) \u098f \u09a8\u09bf\u09ae\u09cd\u09a8\u09c7\u09b0 \u0995\u09cb\u09a1 copy\/paste \u0995\u09b0\u09c7 \u09a6\u09bf\u09a8<\/p>\n<hr \/>\n<pre> var fs = require(\"fs\");\r\n\r\n var data = fs.readFileSync('input.txt');\r\n\r\n console.log(data.toString());\r\n console.log(\"Program Ended\");<\/pre>\n<hr \/>\n<p>\u098f\u0996\u09a8 main.js \u09ab\u09be\u0987\u09b2\u099f\u09bf \u09b0\u09be\u09a8 \u0995\u09b0\u09be\u09a8<\/p>\n<hr \/>\n<p>$ node main.js<\/p>\n<hr \/>\n<p>\u09a8\u09bf\u09ae\u09cd\u09a8\u09c7\u09b0 \u0986\u0989\u099f\u09aa\u09c1\u099f \u09a6\u09c7\u0996\u09c1\u09a8<\/p>\n<hr \/>\n<p>Tutorials Point is giving self learning content<br \/>\nto teach the world in simple and easy way!!!!!<br \/>\nProgram Ended<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>\u0989\u09a6\u09be\u09b9\u09b0\u09a3 (Non-Blocking Code)<\/h2>\n<p>.txt \u09a8\u09be\u09ae\u09c7 \u098f\u0995\u099f\u09bf \u09ab\u09be\u0987\u09b2 \u09a4\u09c8\u09b0\u09c0 \u0995\u09b0\u09c1\u09a8 \u098f\u09ac\u0982 \u09a4\u09be\u09a4\u09c7 \u09a8\u09bf\u09ae\u09cd\u09a8\u09c7\u09b0 text \u099f\u09bf copy\/paste \u0995\u09b0\u09c7 \u09a6\u09bf\u09a8 \u0964<\/p>\n<hr \/>\n<p>Tutorials Point is giving self learning content<br \/>\nto teach the world in simple and easy way!!!!!<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>main.js \u098f \u09a8\u09bf\u09ae\u09cd\u09a8\u09c7\u09b0 \u0995\u09cb\u09a1 copy\/paste \u0995\u09b0\u09c7 \u09a6\u09bf\u09a8<\/p>\n<hr \/>\n<pre>var fs = require(\"fs\");\r\n\r\n fs.readFile('input.txt', function (err, data) {\r\n        if (err) return console.error(err);\r\n        console.log(data.toString());\r\n });<\/pre>\n<pre>console.log(\"Program Ended\");<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u098f\u0996\u09a8 main.js \u09ab\u09be\u0987\u09b2\u099f\u09bf \u09b0\u09be\u09a8 \u0995\u09b0\u09be\u09a8<\/p>\n<hr \/>\n<p>$ node main.js<\/p>\n<hr \/>\n<p>\u09a8\u09bf\u09ae\u09cd\u09a8\u09c7\u09b0 \u0986\u0989\u099f\u09aa\u09c1\u099f \u09a6\u09c7\u0996\u09c1\u09a8<\/p>\n<hr \/>\n<p>Program Ended<br \/>\nTutorials Point is giving self learning content<br \/>\nto teach the world in simple and easy way!!!!!<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">\u098f\u0987 \u09a6\u09c1\u099f\u09bf \u0989\u09a6\u09be\u09b9\u09b0\u09a3 Blocking \u098f\u09ac\u0982 Non-Blocking Code \u09a7\u09be\u09b0\u09a3\u09be\u09b0 \u09ac\u09cd\u09af\u09be\u0996\u09cd\u09af\u09be \u0995\u09b0\u09c7 \u0964 \u09aa\u09cd\u09b0\u09a5\u09ae \u0989\u09a6\u09be\u09b9\u09be\u09b0\u09a8\u09c7, \u09aa\u09cd\u09b0\u09a5\u09ae\u09c7 \u09ab\u09be\u0987\u09b2 \u09aa\u09dc\u09c7 \u098f\u09ac\u0982 \u09ab\u09be\u0987\u09b2 \u09aa\u09dc\u09be \u09b6\u09c7\u09b7 \u09b9\u09b2\u09c7 \u09ac\u09be\u0995\u09bf \u0995\u09cb\u09a1 execute \u0995\u09b0\u09c7 \u0964 \u0985\u09a8\u09cd\u09af\u09a6\u09bf\u0995\u09c7 \u09a6\u09cd\u09ac\u09bf\u09a4\u09c0\u09df \u0989\u09a6\u09be\u09b9\u09be\u09b0\u09a8\u09c7 \u09ab\u09be\u0987\u09b2 \u09aa\u09dc\u09be \u09b6\u09c7\u09b7 \u09b9\u0993\u09df\u09be\u09b0 \u0986\u0997\u09c7\u0987 \u0985\u09a8\u09cd\u09af\u09be\u09a8\u09cd\u09af \u0995\u09cb\u09a1 execute \u0995\u09b0\u09c7 \u09ab\u09c7\u09b2\u09c7 \u0964 \u098f\u0987\u09ad\u09be\u09ac\u09c7\u0987 Blocking \u0995\u09cb\u09a1 sequencely program \u09b0\u09be\u09a8 \u0995\u09b0\u09c7 \u09a5\u09be\u0995\u09c7 \u0985\u09a8\u09cd\u09af\u09a6\u09bf\u0995\u09c7 Non-Blocking Code sequencely program \u09b0\u09be\u09a8 \u0995\u09b0\u09c7 \u09a8\u09be \u0964<\/p>\n<p>http:\/\/www.tutorialspoint.com\/nodejs\/nodejs_callbacks_concept.htm<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u09ae\u09cb\u09b9\u09be\u09ae\u09cd\u09ae\u09a6 \u0986\u09ac\u09cd\u09a6\u09c1\u09b2\u09cd\u09b2\u09be\u09b9 &nbsp; Callback \u0995\u09bf ? Callback \u098f\u0995\u099f\u09bf \u09ab\u09be\u0982\u09b6\u09a8\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u098f\u0995\u099f\u09bf asynchronous \u09b8\u09ae\u09a4\u09c2\u09b2\u09cd\u09af \u0964 \u098f\u0995\u099f\u09bf \u0995\u09b2\u09ac\u09cd\u09af\u09be\u0995 \u09ab\u09be\u0982\u09b6\u09a8 \u098f\u0995\u099f\u09bf \u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u0995\u09be\u099c\u09c7\u09b0 \u09b6\u09c7\u09b7\u09c7 \u09b8\u09be\u09a7\u09be\u09b0\u09a8\u09a4 \u0995\u09b2 \u0995\u09b0\u09be \u09b9\u09df\u09c7 \u09a5\u09be\u0995\u09c7 \u0964 Node.js \u098f callback \u09ab\u09be\u0982\u09b6\u09a8 \u09aa\u09cd\u09b0\u099a\u09c1\u09b0 \u09aa\u09b0\u09bf\u09ae\u09be\u09a8\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u09b9\u09df\u09c7 \u09a5\u09be\u0995\u09c7 \u0964 Node.js \u098f\u09b0 \u09b8\u0995\u09b2 API \u0997\u09c1\u09b2\u09bf \u098f\u09ae\u09a8\u09be\u09ad\u09be\u09ac\u09c7 \u09a4\u09c8\u09b0\u09c0 \u0995\u09b0\u09be \u09b9\u09df\u09c7\u099b\u09c7 \u09af\u09be\u09a4\u09c7 \u0995\u09b0\u09c7 \u09a4\u09be\u09b0\u09be callbacks \u09b8\u09ae\u09b0\u09cd\u09a5\u09a8 \u0995\u09b0\u09c7 \u0964 \u0989\u09a6\u09be\u09b9\u09b0\u09a3\u09b8\u09cd\u09ac\u09b0\u09c2\u09aa, \u098f\u0995\u099f\u09bf &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=11252\">Continue reading<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1,1384],"tags":[1670,1669,706,1387,1671,1668],"class_list":["post-11252","post","type-post","status-publish","format-standard","hentry","category-root","category-----node-js","tag-blocking","tag-callback","tag-code","tag-node-js","tag-non-blocking","tag-1668","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":11249,"url":"http:\/\/bangla.sitestree.com\/?p=11249","url_meta":{"origin":11252,"position":0},"title":"Node.js &#8211; \u09b8\u09be\u09b0\u09cd\u09ac\u099c\u09a8\u09c0\u09a8 \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f (Global Objects)","author":"Author-Check- Article-or-Video","date":"November 10, 2015","format":false,"excerpt":"\u09ae\u09cb\u09b9\u09be\u09ae\u09cd\u09ae\u09a6 \u0986\u09ac\u09cd\u09a6\u09c1\u09b2\u09cd\u09b2\u09be\u09b9 Node.js \u098f\u09b0 \u0997\u09cd\u09b2\u09cb\u09ac\u09be\u09b2 \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f\u0997\u09c1\u09b2\u09cb \u09b8\u09be\u09a7\u09be\u09b0\u09a8\u09a4 \u09b8\u0995\u09b2 \u09ae\u09cb\u09a1\u09bf\u0989\u09b2 \u09a5\u09c7\u0995\u09c7 \u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u098f\u0995\u09b8\u09c7\u09b8 \u0995\u09b0\u09be \u09af\u09be\u09df \u0964 \u09a4\u09be\u0987 \u098f\u0987 \u0997\u09cd\u09b2\u09cb\u09ac\u09be\u09b2 \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f\u0997\u09c1\u09b2\u09cb\u0995\u09c7 \u0995\u09cb\u09a8 \u0985\u09cd\u09af\u09be\u09aa \u09a5\u09c7\u0995\u09c7 \u0985\u09a8\u09cd\u09a4\u09b0\u09cd\u09ad\u09c2\u0995\u09cd\u09a4 \u0995\u09b0\u09a4\u09c7 \u09b9\u09df \u09a8\u09be \u0964 \u098f\u0987 \u0997\u09cd\u09b2\u09cb\u09ac\u09be\u09b2 \u0985\u09ac\u099c\u09c7\u0995\u09cd\u099f\u0997\u09c1\u09b2\u09cb 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