{"id":32548,"date":"2023-01-30T20:05:31","date_gmt":"2023-01-30T14:35:31","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-for-loop-is-too-slow\/"},"modified":"2023-01-30T20:05:31","modified_gmt":"2023-01-30T14:35:31","slug":"solved-for-loop-is-too-slow","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-for-loop-is-too-slow\/","title":{"rendered":"[Solved] For loop is too slow"},"content":{"rendered":"

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You should do a string interpolation or create an Array and then push the values to it.<\/p>\n

In the end, you would append the entire string, or use the Array.prototype.join<\/code> to turn it in a string.<\/p>\n

The for<\/code> loop is fast, the problem there is the I\/O. Take a look at the example below:<\/p>\n

var Combinatorics = require('js-combinatorics');\nvar fs = require('fs');\n\nvar cp = Combinatorics.cartesianProduct(\n  [\"4\", \"@\", \"\/\\\\\", \"\/-\\\\\", \"^\", \"\u2202\", \"\u03bb\", \"\u03b1\", \"(!\", \"Z\", \"\u03b1\"],\n  [\"1\u00b2\", \"2\", \"?\", \"P\\\\\", \"[\\\"\/_\", \"l\\\"\/_\", \"|-\", \"|2\", \"|?\", \"\u00ae\", \"12\", \"\/2\", \"I2\", \"|^\", \"|~\", \"(r)\", \"|`\", \"l2\", \"\u042f\", \"\u0281\", \"\u044f\"],\n  [\"#\", \"(-)\", \")-(\", \"\/-\/\", \"4\", \"<~>\", \"[-]\", \"\\\\-\\\\\", \"]-[\", \"]~[\", \"{-}\", \"{=}\", \"|-|\", \"|~|\", \"}{\", \":-:\", \"}-{\", \"\u043d\"],\n  [\"!\", \"'\", \"1\", \"[]\", \"][\", \"|\", \"\u00a6\", \"\u00a1\", \":\", \"]\", \"\u03b9\"],\n  [\"&\", \"3\", \"\u20ac\", \"\u00a3\", \"\u00eb\", \"[-\", \"|=-\", \"\u0259\", \"\u03b5\"]\n);\n\nfs.appendFile('.\/output.txt', cp.toArray().join('\\n'), function(error) {\n  if (error)\n    console.log('Error writing ' + error);\n});\n<\/code><\/pre>\n
Note: another thing I did here was to cache the cp.toArray()<\/code> into a variable, so you don’t need to call it once per loop iteration. Doing the both things (write to the file only once, and calling .toArray()<\/code> only once either, you’ll have a much better performance, completely sure.<\/p>\n
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UPDATE<\/strong><\/p>\n
I’ve just realized you don’t need a loop at all, since the only thing you’re doing is concatenating a \\n<\/code> for each word you have, and you can do that by calling the Array.prototype.join<\/code> method.<\/p>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved For loop is too slow <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] You should do a string interpolation or create an Array and then push the values to it. In the end, you would append the entire string, or use the Array.prototype.join to turn it in a string. The for loop is fast, the problem there is the I\/O. Take a look at the example below: … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[593,333,902,325],"class_list":["post-32548","post","type-post","status-publish","format-standard","hentry","category-solved","tag-for-loop","tag-javascript","tag-node-js","tag-performance"],"yoast_head":"\n[Solved] For loop is too slow - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-for-loop-is-too-slow\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] For loop is too slow - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You should do a string interpolation or create an Array and then push the values to it. 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