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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...
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...
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...
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',
...
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...
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
...
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...
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...
echo that outputs to stderr
...
Another option
echo foo >>/dev/stderr
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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...