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What does $_ mean in PowerShell?
...r example in the above code the %{} block is called for every value in the array. The $_ or $PSItem variable will contain the current value.
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How to Create Multiple Where Clause Query Using Laravel Eloquent?
...3 (and still true as of 7.x) you can use more granular wheres passed as an array:
$query->where([
['column_1', '=', 'value_1'],
['column_2', '<>', 'value_2'],
[COLUMN, OPERATOR, VALUE],
...
])
Personally I haven't found use-case for this over just multiple where calls, bu...
Common programming mistakes for Clojure developers to avoid [closed]
...a.lang.IllegalArgumentException: Wrong number of args passed to: PersistentArrayMap
because the #() reader macro gets expanded to
(fn [%1 %2] ({%1 %2}))
with the map literal wrapped in parenthesis. Since it's the first element, it's treated as a function (which a literal map actually is), but...
JavaScript: filter() for Objects
ECMAScript 5 has the filter() prototype for Array types, but not Object types, if I understand correctly.
15 Answers
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Convert a list of objects to an array of one of the object's properties
...
You are looking for
MyList.Select(x=>x.Name).ToArray();
Since Select is an Extension method make sure to add that namespace by adding a
using System.Linq
to your file - then it will show up with Intellisense.
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How to return a string value from a Bash function
... referenced by name's value. The -n attribute cannot be applied to
array variables.
...
When used in a function, declare and typeset make each name local,
as with the local command, unless the -g option is supplied...
and also:
PARAMETERS
A variable can be assigned the nameref att...
Scatter plot and Color mapping in Python
I have a range of points x and y stored in numpy arrays.
Those represent x(t) and y(t) where t=0...T-1
3 Answers
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How to make an Android device vibrate?
...e '-1' here means to vibrate once, as '-1' is out of bounds in the pattern array
v.vibrate(pattern, -1);
More Complex Vibrations
There are multiple SDKs that offer a more comprehensive range of haptic feedback. One that I use for special effects is Immersion's Haptic Development Platform for Andr...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...s) = 0.80 and pB(heads)=0.45
# represent the experiments
head_counts = np.array([5,9,8,4,7])
tail_counts = 10-head_counts
experiments = zip(head_counts,tail_counts)
# initialise the pA(heads) and pB(heads)
pA_heads = np.zeros(100); pA_heads[0] = 0.60
pB_heads = np.zeros(100); pB_heads[0] = 0.50
#...
Is object empty? [duplicate]
...t with non-enumerable properties and Object.keys will just return an empty array... Object.getOwnPropertyNames returns an array containing all the own properties of an object, even if they aren't enumerable.
– Christian C. Salvadó
Feb 14 '11 at 16:11
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