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Java: Instanceof and Generics
...e) {
//...
You are casting the object to T (your generic type), just to fool the compiler. Your cast does nothing at runtime, but you will still get a ClassCastException when you try to pass the wrong type of object into your abstract method.
NOTE 1: If you are doing additional unchecked casts i...
Can I do a partial revert in GIT
... I wanted to revert only part of a commit, so I did: (1) git show ... > foo.txt (2) edit foo.txt to remove the diffs I wanted not to revert (3) git apply --reverse foo.txt to revert the diffs still listed in foo.txt.
– cxw
Mar 19 '18 at 17:49
...
How to split long commands over multiple lines in PowerShell
...
If you have a function:
$function:foo | % Invoke @(
'bar'
'directory'
$true
)
If you have a cmdlet:
[PSCustomObject] @{
Path = 'bar'
Type = 'directory'
Force = $true
} | New-Item
If you have an application:
{foo.exe @Args} | % Invoke @(
...
How to execute PHP code from the command line?
...line
You can use php's -r switch as such:
php -r 'echo function_exists("foo") ? "yes" : "no";'
The above PHP command above should output no and returns 0 as you can see:
>>> php -r 'echo function_exists("foo") ? "yes" : "no";'
no
>>> echo $? # print the return value of the pr...
How to merge dictionaries of dictionaries?
...Case: "leaves are nested dicts that end in empty dicts":
d1 = {'a': {1: {'foo': {}}, 2: {}}}
d2 = {'a': {1: {}, 2: {'bar': {}}}}
d3 = {'b': {3: {'baz': {}}}}
d4 = {'a': {1: {'quux': {}}}}
This is the simplest case for recursion, and I would recommend two naive approaches:
def rec_merge1(d1, d2):...
Assert a function/method was not called using Mock
...uments.
>>> ((42,),) in m.call_args_list
True
>>> m(42, foo='bar')
<MagicMock name='mock()' id='139675158423872'>
>>> ((42,), {'foo': 'bar'}) in m.call_args_list
True
>>> m(foo='bar')
<MagicMock name='mock()' id='139675158423872'>
>>> ((), {'...
Can I specify multiple users for myself in .gitconfig?
...tern ends with /, ** will be automatically added. For example, the pattern foo/ becomes foo/**. In other words, it matches "foo" and everything inside, recursively.”, “; include for all repositories inside $HOME/to/group [includeIf "gitdir:~/to/group/"]”
– Tomáš Janouš...
Detecting an “invalid date” Date instance in JavaScript
...
Instead of using new Date() you should use:
var timestamp = Date.parse('foo');
if (isNaN(timestamp) == false) {
var d = new Date(timestamp);
}
Date.parse() returns a timestamp, an integer representing the number of milliseconds since 01/Jan/1970. It will return NaN if it cannot parse the su...
How can I mock dependencies for unit testing in RequireJS?
...ould log', function(){
spyOn(console, 'log');
yourModule.foo();
expect(console.log).toHasBeenCalledWith('hurp');
})
});
});
})();
So I'm using this approach in production for a while and its really robust.
...
Viewing all defined variables [duplicate]
...th the modulo character unless the automagic feature is enabled):
In [1]: foo = 'bar'
In [2]: %who
foo
You can use the whos magic to get more detail:
In [3]: %whos
Variable Type Data/Info
----------------------------
foo str bar
There are a wealth of other magics available. IPy...