Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote 4 down vote favorite Using javascript functions and the old way of doing things I wrote a piece of code to copy the first file in a directory to a file Test . console.log("Copy First File"); var fs = require('fs'); fs.readdir(".", function(err, files) if (err) console.log(err);process.exit(1); fs.exists(files[0], function(exits) fs.readFile(files[0], function(err, data) if (err) console.log(err);process.exit(1); fs.writeFile('Test', data, function(err) if (err) console.log(err);process.exit(1); console.log("Data Copied"); ); ) ); ); After reading about Promises (and several failed attempts). I managed to convert the above to use Promise and .then() chaining. function getAListOfFiles() return new Promise(function(resolve, reject) fs.readdir(".", function(err, files) if (err)...

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<!-- main_leaderboard, all: [728,90][970,90][320,50][468,60] --> Python Lists ❮ Previous Next ❯ Python Collections (Arrays) There are four collection data types in the Python programming language: List is a collection which is ordered and changeable. Allows duplicate members. Tuple is a collection which is ordered and unchangeable. Allows duplicate members. Set is a collection which is unordered and unindexed. No duplicate members. Dictionary is a collection which is unordered, changeable and indexed. No duplicate members. When choosing a collection type, it is useful to understand the properties of that type. Choosing the right type for a particular data set could mean retention of meaning, and, it could mean an increase in efficiency or security. List A list is a collection which is ordered and changeable. In Python lists are written with square brackets. Example Create a List: thislist = ["apple", "banana", ...