spread-syntax Questions
25
Solved
What does the ... do in this React (using JSX) code and what is it called?
<Modal {...this.props} title='Modal heading' animation={false}>
Timberlake asked 25/6, 2015 at 11:21
49
Both Object.assign and Object spread only do a shallow merge.
An example of the problem:
// No object nesting
const x = { a: 1 }
const y = { b: 1 }
const z = { ...x, ...y } // { a: 1, b: 1 }
Th...
Analog asked 14/1, 2015 at 6:7
3
Solved
I am using node and i have used .
babel-node
"start": "nodemon --exec babel-node --presets es2015 index.js"
My spread syntax is not working as expected. Here is my code.
export const login =...
Exertion asked 1/3, 2019 at 19:38
6
Is there any implementation in C# like JavaScript's spread syntax?
var arr = new []{"Hello", "World"};
Console.WriteLine(...arr);
3rd party edit
Using a method
public void gree...
Suckle asked 6/10, 2016 at 2:45
6
Solved
I was trying to understand what is the difference between spread syntax vs slice method in the following approach.
suppose I want to make an actual copy of an array, I can probably easily do it us...
Overstuffed asked 3/7, 2018 at 23:53
4
Solved
At ECMAScript specification the SpreadElement is described
SpreadElement[Yield]:
...AssignmentExpression[In, ?Yield]
Is this the same as the Spread syntax
Spread syntax allows an iterable su...
Politicking asked 11/5, 2016 at 2:13
5
Solved
From mdn: Spread Syntax
Note: Typically the spread operators in ES2015 goes one level deep while copying an array. Therefore, they are unsuitable for copying multidimensional arrays. It's the s...
Taub asked 15/4, 2017 at 2:55
15
Solved
I am trying to create a deep copy map method for my Redux project that will work with objects rather than arrays. I read that in Redux each state should not change anything in the previous states.
...
Candracandy asked 16/7, 2016 at 21:57
6
Solved
I want to perform Destructuring in php just like in javascript code below:
[a, b, ...rest] = [10, 20, 30, 40, 50];
console.log(a,b,rest);
Output:
10 20 [ 30, 40, 50 ]
How can I preform that opera...
Dermatologist asked 3/3, 2023 at 5:58
4
Solved
I understand spread syntax makes a shallow copy of objects, i.e., the cloned object refers to the same reference as the original object.
However, the actual behaviour seems contradicting and confus...
Pied asked 25/4, 2020 at 6:35
9
Solved
I am running into an error that says
Type must have a '[Symbol.iterator]()' method that returns an iterator.
It hopes on the demarcated line:
class Test {
private async do() {
const done = [...(...
Genro asked 8/5, 2018 at 13:11
3
Solved
I have a function that adds a key to incoming object, but I have been told to use the spread operator for that, I have been told that I can use the spread operator to create a new object with the s...
Rostellum asked 26/3, 2018 at 12:22
4
Solved
I'm trying to convert a data structure like this:
data = {
0:{A:a},
1:{B:b},
2:{C:c},
}
into a structure like this:
[
{0:{A:a}},
{1:{B:b}},
{2:{C:c}},
]
Using the spread operator l...
Archaeornis asked 24/7, 2017 at 16:0
5
Solved
I have a problem with code I am supposed to work with. I found a syntax I am not familiar with and I have trouble googling the documentation:
export const Something = class Something {
constructo...
Adolfoadolph asked 26/1, 2018 at 15:16
7
Solved
Consider the following sample code
var x = ["a", "b", "c"];
var z = ["p", "q"];
var d = [...x, ...z];
var e = x.concat(z);
Here, the value of d ...
Stanzel asked 1/1, 2016 at 20:48
4
Solved
So I have an array, ex. const arr = [1, 2, 3, 4];. I'd like to use the spread syntax ... to remove the first element.
ie. [1, 2, 3, 4] ==> [2, 3, 4]
Can this be done with the spread syntax?
Edi...
Eidolon asked 25/8, 2018 at 22:35
8
Solved
I'm replacing an item in a react state array by using the ... spread syntax. This works:
let newImages = [...this.state.images]
newImages[4] = updatedImage
this.setState({images:newImages})
...
Amendment asked 14/8, 2017 at 11:43
3
Solved
Why does spreading undefined in an object return an empty object? {...undefined} // equals {}:
console.log({...undefined})
And Why does spreading undefined in an array give you an error...
Forenamed asked 7/11, 2017 at 10:9
3
Solved
Given the following example:
// option 1
items.reduce((values, item) => ({
...values,
[item.id]: item.name
}), {})
// option 2
items.reduce((values, item) => {
values[item.id] = item.na...
Conic asked 30/11, 2019 at 23:36
4
Solved
Basically here's what I'm trying to accomplish.
class Person {
constructor (obj) {
this.first = ''
this.last = ''
this.age = ''
if (obj) {
Object.assign(this, ...obj)
}
}
}
...
Perspiratory asked 18/9, 2017 at 6:55
1
Solved
The following gives error TS2556, how do I fix it?
class Test {
constructor(x: number) {}
}
class Test2 extends Test {
constructor(...args) {
super(...args); // TS2556
}
}
Or if you are using...
Payola asked 14/9, 2021 at 19:33
6
Solved
I have been struggling with a really annoying behaviour of Visual Studio Code recently.
Whenever I try to use the JavaScript spread syntax VSCode automatically autocompletes the next piece of code ...
Kieserite asked 9/8, 2021 at 17:28
2
Solved
I tried to write ternary operator with spread syntax and copy two objects. Is it possible to use ternary operator with spread syntax inside with literal objects? My code works okay, I just want to ...
Aerial asked 19/7, 2017 at 8:13
7
Solved
I am using following code to get unique numbers:
let uniques = [ ...new Set([1, 2, 3, 1, 1]) ]; // [1, 2, 3]
However, typescript report following error: Type 'Set' is not an array type.
I am not...
Ruiz asked 1/11, 2015 at 16:38
5
Solved
In my flutter app, I have widgets like below:
Container(
decoration: BoxDecoration(
border: Border.all(
color: Colors.red,
width: 2,
style: BorderStyle.solid,
),
),
child: Text('Container ...
Krisha asked 7/3, 2019 at 10:34
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