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Install a module using pip for specific python version
...hon version you want to install the package for:
python2.7 -m pip install foo
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Add a default value to a column through a migration
...ng defaults for existing records. For example: def change ` add_column :foos, :name, default: "something for existing values"` ` change_column_default :foos, :name, default: ""` end
– user1491929
Jan 4 '16 at 16:14
...
Convert command line arguments into an array in Bash
...rameters for the scope. It also lets you set shell options. You can do set foo, which will mean $1 expands to "foo", but if your parameters start with a dash set will assume you mean to set a shell option. The double-dash ensures that all the following parameters are interpreted as positional parame...
Breaking out of nested loops [duplicate]
... return statement can be used to exit the outermost loop at any time.
def foo():
for x in range(10):
for y in range(10):
print(x*y)
if x*y > 50:
return
foo()
If it's hard to extract that function you could use an inner function, as @bjd2385 s...
How can a Javascript object refer to values in itself? [duplicate]
...g constructor function instead of literal
var o = new function() {
this.foo = "it";
this.bar = this.foo + " works"
}
alert(o.bar)
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Case insensitive comparison of strings in shell script
...:
local orig_nocasematch=$(shopt -p nocasematch)
shopt -s nocasematch
[[ "foo" == "Foo" ]] && echo "match" || echo "notmatch"
$orig_nocasematch
Note: only use local if it's inside a function.
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Reflection - get attribute name and value on property
... Program
{
static void Main()
{
PropertyInfo prop = typeof(Foo).GetProperty("Bar");
var vals = GetPropertyAttributes(prop);
// has: DisplayName = "abc", Browsable = false
}
public static Dictionary<string, object> GetPropertyAttributes(PropertyInfo prope...
What's the difference between array_merge and array + array?
...vs-plus-aka-union/
Stop using array_merge($defaults, $options):
function foo(array $options)
{
$options += ['foo' => 'bar'];
// ...
}
Note: array_replace function exists since PHP5.3.
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How to check whether a string contains a substring in Ruby
...returns the index of the character where the match happens. For example:
"foobar" =~ /bar/ # returns 3
"foobar" =~ /foo/ # returns 0
"foobar" =~ /zzz/ # returns nil
It's important to note that in Ruby only nil and the boolean expression false evaluate to false. Everything else, including an em...
How to set DOM element as the first child?
...alue will be added as a text element.
Examples:
parent.prepend(newChild, "foo") // [newChild, "foo", child1, child2]
const list = ["bar", newChild]
parent.append(...list, "fizz") // [child1, child2, "bar", newChild, "fizz"]
Related DOM methods
Read More - child.before and child.after
Read M...