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Converting JavaScript object with numeric keys into array
...DDLE
and almost as easy without jQuery as well, converting the keys to an array and then mapping back the values with Array.map
var arr = Object.keys(obj).map(function(k) { return obj[k] });
FIDDLE
That's assuming it's already parsed as a javascript object, and isn't actually JSON, which is a s...
TypeScript typed array usage
...tax here:
this._possessions = new Thing[100]();
This doesn't create an "array of things". To create an array of things, you can simply use the array literal expression:
this._possessions = [];
Of the array constructor if you want to set the length:
this._possessions = new Array(100);
I have...
“Cloning” row or column vectors
...
Here's an elegant, Pythonic way to do it:
>>> array([[1,2,3],]*3)
array([[1, 2, 3],
[1, 2, 3],
[1, 2, 3]])
>>> array([[1,2,3],]*3).transpose()
array([[1, 1, 1],
[2, 2, 2],
[3, 3, 3]])
the problem with [16] seems to be that the tran...
clearing a char array c
...ting the first element to a null would clear the entire contents of a char array.
16 Answers
...
How to remove specific value from array using jQuery
I have an array that looks like this: var y = [1, 2, 3];
20 Answers
20
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How to get the difference between two arrays in JavaScript?
Is there a way to return the difference between two arrays in JavaScript?
69 Answers
6...
Best practice? - Array/Dictionary as a Core Data Entity Attribute [closed]
...ute types and would like to know what the most efficient way is of storing array/dictionary type data as an attribute (e.g. the elements that make up an address like street, city, etc. does not require a separate entity and is more conveniently stored as a dictionary/array than separate attributes/f...
How can I initialize a String array with length 0 in Java?
...
As others have said,
new String[0]
will indeed create an empty array. However, there's one nice thing about arrays - their size can't change, so you can always use the same empty array reference. So in your code, you can use:
private static final String[] EMPTY_ARRAY = new String[0];
...
Javascript reduce on array of objects
...ce takes in a function to perform operations on each of the elements in an array. Every time it returns a value that is used as the next 'a' variable in the operation. So first iteration a = {x:1}, b = {x:2} then second iteration a = {x:3} (combined value of first iteration), b = {x:4}. The problem ...
Concatenate two slices in Go
... to say it has a copy of the light-weight reference to the same underlying array, len and cap. If the foo function alters a member, the change will be seen on the original. Here's a demo. So the only real overhead will be that it creates a new slice if you didn't have one already, like: foo(1, 2, 3,...