500 questions
1
vote
1
answer
60
views
Angular FormBuilder with spread operator on object with arrays has FormControls of the wrong type
I'm using the Angular FormBuilder (import { FormBuilder } from '@angular/forms';) to create my FormGroup and inner FormControls as this right now:
formGroup = new FormBuilder().nonNullable.group({
....
- 9,364
0
votes
1
answer
46
views
Is the spread operator (...) available in AssemblyScript?
I couldn't find any information about this in the AssemblyScript docs.
Is the spread operator available in AssemblyScript? I would like to define an object like so:
{ ...params, category: "...
- 22.2k
0
votes
2
answers
60
views
TypeScript misunderstanding. How to fix problem?
Have a code (typescriptPlayground)
problem is in spread operator.
in case of secondObjectFull i have an error. It is ok. firstObject cannot spread to secondFullMapped
But in case of thirdObjectFull ...
- 35
-2
votes
3
answers
63
views
JavaScript 2D arrays and returning matching rows
I have 2 arrays, each is like a database table row set.
array1 = [
['AB2C', 'Red', 113],
['BE4F', 'Green', 164],
['AE3G', 'Blue', 143],
]
array2 = [
[143, 'FabricB2', 'W5'],
[189, 'FabricC9', 'W4'],
[...
0
votes
0
answers
67
views
Type error when using generics and looping over functions
I have an object of methods which I am seeking to extend with copies of those methods but scoped to a given method e.g. the method fetchOnce() will have copies postOnce(), getOnce() etc.
The original ...
- 23.7k
0
votes
3
answers
251
views
Prepend an element to each list in a list
Let's say we have the following base list:
[["foo"],["bar"]]
and the input string "a"
I want to prepend the input string to each list in the list, which results in:
[[&...
- 2,679
0
votes
1
answer
79
views
Spread not works for Array(16) _wgpuMatrix.mat4.invert return NUll filled array
For matrix transformation i use wgpu-matrix library.
I already have implemented raycast (hit object trigger) in other project. I wanna implement it also in my new project matrix-engine-wgpu.
In this ...
- 4,292
0
votes
2
answers
178
views
Is there an easy way to merge object arrays using javascript ellipsis or similar?
let arr = [
{id: 1, data: {foo: "bar 1"}},
{id: 2, data: {foo: "bar 2"}}
];
//In case the ID does not exist just add as a new element on the array
arr = [...arr, {id: 3, data: {foo: "bar 3"}}]
...
- 668
1
vote
1
answer
82
views
is there a typescript generic that handles T | T[] | "*"
I'm new to generics in typescript, it's confusing
is there a way to make the spread operator ... work in the snippet below
the issue
the line [ key: U, ...rest: Reg[U] ], doesn't work as I expect
the ...
- 75
2
votes
1
answer
349
views
How to create a type that enforces exclusion of properties in typescript when using spread operator?
I have a backend model with some properties that I want to be able to send to the frontend with certain properties excluded. I'd like to use typing to help me ensure they have been excluded.
I tried ...
- 2,454
1
vote
0
answers
29
views
extract partial attributes of an object using typescript types [duplicate]
how to extract partial attributes of an object using typescript types? is it even possible?
export interface Product {
brandName: string;
modelNo: string;
rate: number | null;
someOtherProp1: ...
- 14.2k
1
vote
0
answers
43
views
Why does Javascript spread maintain defined keys that are set to undefined, and how do they differ from non-existent keys? [duplicate]
I have a code sample below that demonstrates this. I ran into this unexpected behavior of the spread operator where a key that gets set as undefined is not treated the same way keys that have never ...
- 389
1
vote
4
answers
170
views
Cannot use spread inside conditional operator [duplicate]
Suppose the following:
const arr = [1, 2, 3];
const insertValues = [-1, 0];
const condition = true;
arr.splice(0, 0, condition ? ...insertValues : insertValues);
This throws a syntax error:
...
- 6,625
0
votes
0
answers
56
views
Using immutability-helper or spread op to make changes to an object, what is better: repeatedly $set, or $merge only once an object with all changes?
In my state I have a dictionary of a flat object:
export interface INodeVisibility {
id: string;
level: number;
isExpanded: boolean;
}
export type NodeVisibilityDict = { [key: string]: ...
- 75
1
vote
1
answer
125
views
React State modification despite the fact I used spread operator to avoid direct modification of it
I tried to use spread operator to avoid modifications of my state without the use the set State. But despite that, my state is still modified.
I can eventually make a deepCopy of my state but I don't ...
- 61