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How to create a file with a given size in Linux?

...lease, modern is easier, and faster. On Linux, (pick one) truncate -s 10G foo fallocate -l 5G bar It needs to be stated that truncate on a file system supporting sparse files will create a sparse file and fallocate will not. A sparse file is one where the allocation units that make up the file ar...
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How to check if a variable is an integer in JavaScript?

... // false isInt(42.1) // false isInt("1a") // false isInt("4e2a") // false isInt(null) // false isInt(undefined) // false isInt(NaN) // false Here's the fiddle: http://jsfiddle.net/opfyrqwp/28/ Performance Testing reveals that the short-circuiting solution has the bes...
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How to add property to a class dynamically?

...But that's the catch: you have to add it to the class. >>> class Foo(object): ... pass ... >>> foo = Foo() >>> foo.a = 3 >>> Foo.b = property(lambda self: self.a + 1) >>> foo.b 4 A property is actually a simple implementation of a thing called a d...
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parseInt vs unary plus, when to use which?

...95"', '"123456789012345678"', '"12e999"', '""', '"123foo"', '"123.45foo"', '" 123 "', '"foo"', '"12e"', '"0b567"', '"0o999"', '"0xFUZZ"', '"+0"', '"-0"', '"Infinity"', '"+Infinity"', '"-Infinity"', 'null', ...
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How to parse JSON in Python?

... For example, you can't parse r'{"foo": null, "bar": true, "baz": "\ud83e\udd26"}' using ast.literal_eval(), because it contains nulls, a boolean value, and a single non-BMP codepoint. JSON represents those values differently from how Python literals would re...
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How do I set a variable to the output of a command in Bash?

...rs which could be interpreted as part of the variable name. e.g. ${OUTPUT}foo. They are also required when performing inline string operations on the variable, such as ${OUTPUT/foo/bar} – rich remer Jun 1 '16 at 23:16 ...
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How to make rounded percentages add up to 100%

... properly, here's my semi-obfuscated version using underscorejs: function foo(l, target) { var off = target - _.reduce(l, function(acc, x) { return acc + Math.round(x) }, 0); return _.chain(l). sortBy(function(x) { return Math.round(x) - x }). map(function(x, i) { re...
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Fastest way to flatten / un-flatten nested JSON objects

...ation for object properties and the bracket notation for array indices: {foo:{bar:false}} => {"foo.bar":false} {a:[{b:["c","d"]}]} => {"a[0].b[0]":"c","a[0].b[1]":"d"} [1,[2,[3,4],5],6] => {"[0]":1,"[1][0]":2,"[1][1][0]":3,"[1][1][1]":4,"[1][2]":5,"[2]":6} In my opinion this format is b...
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echo that outputs to stderr

... Another option echo foo >>/dev/stderr share | improve this answer | follow | ...
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Pass entire form as data in jQuery Ajax function

...select> options are serialized under the same key, e.g. <select id="foo" name="foo" multiple="multiple"> <option value="1">one</option> <option value="2">two</option> <option value="3">three</option> </select> will result in a query s...