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arrays

Replace keys in an array based on another lookup/mapping array

by IT Nursery

$arr[$newkey] = $arr[$oldkey]; unset($arr[$oldkey]);

Tags arrays, associative-array, key, mapping, php

What is the difference between np.array() and np.asarray()?

by IT Nursery

The definition of asarray is: def asarray(a, dtype=None, order=None): return array(a, dtype, copy=False, order=order) So it is like array, except it has fewer … Read more

Tags arrays, numpy, python

How do I create an empty array and then append to it in NumPy?

by IT Nursery

That is the wrong mental model for using NumPy efficiently. NumPy arrays are stored in contiguous blocks of memory. To append rows or … Read more

Tags arrays, numpy, python

JavaScript, Node.js: is Array.forEach asynchronous?

by IT Nursery

No, it is blocking. Have a look at the specification of the algorithm. However a maybe easier to understand implementation is given on … Read more

Tags arrays, asynchronous, foreach, javascript, node.js

How to filter an associative array comparing keys with values in an indexed array?

by IT Nursery

With array_intersect_key and array_flip: var_dump(array_intersect_key($my_array, array_flip($allowed))); array(1) { [“foo”]=> int(1) }

Tags arrays, filtering, key, php, whitelist

How to map/collect with index in Ruby?

by IT Nursery

If you’re using ruby 1.8.7 or 1.9, you can use the fact that iterator methods like each_with_index, when called without a block, return … Read more

Tags arrays, indexing, ruby

How to check if an array is empty or exists?

by IT Nursery

if (typeof image_array !== ‘undefined’ && image_array.length > 0) { // the array is defined and has at least one element } Your … Read more

Tags arrays, javascript, jQuery

How to get the last element of an array without deleting it?

by IT Nursery

How to get the last element of an array without deleting it?

Tags arrays, php

How do I declare an array in Python?

by IT Nursery

variable = [] Now variable refers to an empty list*. Of course this is an assignment, not a declaration. There’s no way to … Read more

Tags arrays, list, python

How do I access the ith column of a NumPy multidimensional array?

by IT Nursery

To access column 0: >>> test[:, 0] array([1, 3, 5]) To access row 0: >>> test[0, :] array([1, 2]) This is covered in … Read more

Tags arrays, numpy, python
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