All Questions
15 questions
0
votes
1
answer
46
views
function returning None (functional programming) [duplicate]
I'm trying to make an functional function and I want it to return an array (ndarray). I don't know why, but my code is returning None.
Here's my code:
def upgrade_array(array:np.ndarray, max_value:int,...
5
votes
2
answers
413
views
Vector of functions in APL
What is the syntax for a vector (array) of functions in APL?
I have tried the following but these are interpreted as a 3-train and a 2-train, respectively:
{1},{2}
{1} {2}
PS. I am looking to do ...
- 20.3k
0
votes
1
answer
321
views
Array Assignment in Functional Programming JS [closed]
When declaring a new local variable inside a function and assigning it to a global variable that is equal to an array, what is better?
Option 1: Using the Spread Operator:
let globalArray = [1, 2, 4];
...
- 57
-1
votes
2
answers
123
views
List self nesting in Javascript
Question
I am trying to achieve a function that transforms a list into a second list with two sublist of itself. This function must do so by being called in a chain
i.e
[1,2,3] => [[1,2,3],[1,2,3]]...
- 390
1
vote
2
answers
326
views
what is the difference between filtering on accumulator/current in reduce method
When chaining the Array.prototype.reduce with Array.prototype.filter what is the difference (conceptually and under the hood) when filtering on the current value instead of the accumulator value?
// ...
-1
votes
1
answer
67
views
Why doesn't JS complier recognize this call to Array.prototype.filter
I am trying to figure out why my call to .prototype.filter is giving me a TypeError: curr.filter is not a function.
const intersection = (arrays) => {
return arrays.reduce((acc, curr) => {
...
1
vote
1
answer
48
views
Typescript array of function traversal question
My program has a place where many conditions are checked.
As opposed to writing a big if(conditionOne || conditionTwo || ...) type of expressions, I decided to define an array of filters like so:
...
- 193
0
votes
4
answers
86
views
How does this functional Javascript example work?
I just don't seem to be able to wrap my head around this snippet of code. Could you give me a hint or two on it?
var filteredList = watchList.map(function(e) {
return {title: e["Title"], rating: ...
user3498459
1
vote
1
answer
627
views
Receive array of either Int or Double in Scala function
I have the following normalization function:
...
private def NormalizeValues(dataValues: Array [Double]): Array[Double] = {
val min = dataValues.min
val max = dataValues.max
dataValues.map(v => (...
- 672
0
votes
4
answers
92
views
How to make my JS solution functional?
I've got some data that came from classy service in Angular that looks like this (briefly):
const obj = {
field: [
{
id: 1,
items: []
},
{
id: 2,
items: [ { ...
2
votes
4
answers
121
views
Why passing function reference is failing while using function declaration is not?
Following code fails:
array.map(String.prototype.toLowerCase)
Throws Uncaught TypeError: String.prototype.toLowerCase called on null or undefined. Indeed, this is not set, I got it.
But what's weird ...
- 48.9k
0
votes
1
answer
902
views
2D array in F Sharp
I have just started learning f# and developed a basic game however, at the moment you specify the cell to play on using a single array. For example to place an X or O on the middle cell, you would ...
- 49
0
votes
2
answers
201
views
JavaScript function composition from 3 functions
I'm using Vue and trying to filter an array of results using a JS function composition.
My Vue computed values are like so, but can't get filteredByAll to accept a third option getByThing. Right now ...
- 1,325
0
votes
0
answers
34
views
Why Doesn't Copied Array Equal Original Array? [duplicate]
I've been learning more about functional programming and the idea of keeping functions pure. So I experimented with taking an array and making a copy of it with the slice function like so...
var ...
12
votes
6
answers
1k
views
An alternative to an array of functions?
I'm programming an app (php) which requires a very long list of similar yet different functions, which are being called by a set of keys:
$functions = [
"do this" => function() {
// ...
- 987