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"readme": "[](http://travis-ci.org/wdavidw/node-printf)\n\n\n _ _ __ \n (_) | | / _|\n _ __ _ __ _ _ __ | |_| |_ \n | '_ \\| '__| | '_ \\| __| _|\n | |_) | | | | | | | |_| | \n | .__/|_| |_|_| |_|\\__|_| \n | | \n |_| \n\n
\n\nA complete implementation of the **`printf` C functions family**\nfor [Node.JS][node], written in pure JavaScript.\n\nThe code is strongly inspired by the one available in the [Dojo Toolkit][dojo].\n\n**Bonus!** You get extra features, like the `%O` converter (which `inspect`s\nthe argument). See [Extra Features](#extra-features) below.\n\n[](https://nodei.co/npm/printf/) [](https://nodei.co/npm/printf/)\n\nInstalling\n----------\n\nVia [NPM][npm]:\n\n``` bash\n$ npm install printf\n```\n\nUsage\n-----\n\nUse it like you would in C (`printf`/`sprintf`):\n\n``` javascript\nvar printf = require('printf');\nvar result = printf(format, args...);\n```\n\nIt can also output the result for you, as `fprintf`:\n\n``` javascript\nvar printf = require('printf');\nprintf(write_stream, format, args...);\n```\n\nFeatures\n--------\n \n### Flags\n\n##### ` ` (space)\n\n``` javascript\nassert.eql(' -42', printf('% 5d', -42));\n```\n\n##### `+` (plus)\n\n``` javascript\nassert.eql(' +42', printf('%+5d', 42));\n```\n\n##### `0` (zero)\n\n``` javascript\nassert.eql('00042', printf('%05d', 42));\n```\n\n##### `-` (minus)\n\n``` javascript\nassert.eql('42 ', printf('%-5d', 42));\n```\n\n### Width / precision\n\n``` javascript\nassert.eql('42.90', printf('%.2f', 42.8952));\nassert.eql('042.90', printf('%06.2f', 42.8952));\n```\n\n### Numerical bases\n\n``` javascript\nassert.eql('\\x7f', printf('%c', 0x7f));\nassert.eql('a', printf('%c', 'a'));\nassert.eql('\"', printf('%c', 34));\n```\n\n### Miscellaneous\n\n``` javascript\nassert.eql('10%', printf('%d%%', 10));\nassert.eql('+hello+', printf('+%s+', 'hello'));\nassert.eql('$', printf('%c', 36));\n```\n\nExtra features!\n---------------\n\n### Inspector\n\nThe `%O` converter will call [`util.inspect(...)`][util_inspect] at the argument:\n\n``` javascript\nassert.eql(\"Debug: { hello: 'Node', repeat: false }\",\n printf('Debug: %O', {hello: 'Node', \"repeat\": false})\n);\nassert.eql(\"Test: { hello: 'Node' }\",\n printf('%2$s: %1$O', {\"hello\": 'Node'}, 'Test')\n);\n```\n\n**Important:** it's a capital \"O\", *not* a zero!\n\nSpecifying a precision lets you control the depth up to which the object is formatted:\n\n``` javascript\nassert.eql(\"Debug: { depth0: { depth1_: 0, depth1: [Object] } }\",\n printf('Debug: %.1O', {depth0: {depth1: {depth2: {depth3: true}}, depth1_: 0}})\n);\n```\n\nYou can use the alternative form flag together with `%O` to disable representation of non-enumerable properties (useful for arrays):\n\n``` javascript\nassert.eql(\"With non-enumerable properties: [ 1, 2, 3, 4, 5, [length]: 5 ]\",\n printf('With non-enumerable properties: %O', [1, 2, 3, 4, 5])\n);\nassert.eql(\"Without non-enumerable properties: [ 1, 2, 3, 4, 5 ]\",\n printf('Without non-enumerable properties: %#O', [1, 2, 3, 4, 5])\n);\n```\n\n### Argument mapping\n\nIn addition to the old-fashioned `n$`,\nyou can use **hashes** and **property names**!\n\n``` javascript\nassert.eql('Hot Pockets',\n printf('%(temperature)s %(crevace)ss', {\n temperature: 'Hot',\n crevace: 'Pocket'\n })\n);\nassert.eql('Hot Pockets',\n printf('%2$s %1$ss', 'Pocket', 'Hot')\n);\n```\n\n### Positionals\n\nLenght and precision can now be variable:\n\n``` javascript\nassert.eql(' foo', printf('%*s', 'foo', 4));\nassert.eql(' 3.14', printf('%*.*f', 3.14159265, 10, 2));\nassert.eql('000003.142', printf('%0*.*f', 3.14159265, 10, 3));\nassert.eql('3.1416 ', printf('%-*.*f', 3.14159265, 10, 4));\n```\n\nDevelopment\n-----------\n\nTests are written in [CoffeeScript][coffee] executed with [Mocha][mocha]. To use it, simple run `npm install`, it will install\nMocha and its dependencies in your project's `node_modules` directory followed by `npm test`.\n\nTo run the tests:\n\n```bash\nnpm install\nnpm test\n```\n\nThe test suite is run online with [Travis][travis] against the versions 0.9, 0.10 and 0.11 of \nNode.js.\n\nContributors\n------------\n\n* David Worms \n* Aluísio Augusto Silva Gonçalves \n* Xavier Mendez \n* LLeo \n* Derrell Lipman \n\n\n[dojo]: http://www.dojotoolkit.org \"The Dojo Toolkit\"\n[node]: http://nodejs.org \"The Node.JS platform\"\n[npm]: https://github.com/isaacs/npm \"The Node Package Manager\"\n[util_inspect]: http://nodejs.org/api/util.html#util_util_inspect_object_showhidden_depth_colors \"util.inspect() documentation\"\n[expresso]: http://visionmedia.github.com/expresso \"The Expresso TDD\"\n[travis]: https://travis-ci.org \"Continuous Integration system\"\n[mocha]: http://visionmedia.github.io/mocha \"The Mocha test framework\"\n[coffee]: http://coffeescript.org/\n",
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