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js spread

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Rodrigo E Toobe answered on February 1, 2020 Popularity 10/10 Helpfulness 2/10

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Comment

//ES6 spread operator, equivalent to .concat() method: array1.concat(array2)
let arr1 = ['1', '2', '3'] //using let because the reference is gonna change.
const arr2 = [4, 5, 6] //const because the reference for arrr2 is not gonna change
arr1 = [...arr1, ...arr2]  //the triple dots ... removes the [ and ] leaving only an "instance of" inside.

output:
['1', '2', '3', 4, 5, 6 ]

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: concat javascript spread

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Contributed on Oct 29 2022

Rodrigo E Toobe

0 Answers Avg Quality 2/10

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javascript spread operator

Comment

function sum(x, y, z) {
  return x + y + z;
}

const numbers = [1, 2, 3];

console.log(sum(...numbers));
// expected output: 6

console.log(sum.apply(null, numbers));
// expected output: 6

Popularity 10/10 Helpfulness 3/10 Language javascript

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Tags: javascript j

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Contributed on Feb 01 2020

Long Locust

0 Answers Avg Quality 2/10

Javascript spread operator

Comments(1)

var num = [2, 4, 6, 8, 10];
console.log(...num)
//expected output: 2 4 6 8 10
console.log(88, ...num, 99) 
// added extra new elements before and after the spread operator
//expected output: 88 2 4 6 8 10 99

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 03 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

Javascript spread operator

Comment

syntax:
...iterable
where, iterable is source like array, object, string etc 

const a=[1,2]
console.log(...a)
// prints 1 2

***spread operator makes a copy of source, not reference.
// ex. - if a & b are 2 arrays
a=[...b]
//changing a won't affect b & vice versa

*Also since it copies source, something like this is also possible:
const a=[5,1]
const b=[2]
const c=[...b,...a]
// c is [2,5,1]

*********************************************
For object just use {} instead of []
const a={ap:4}
const c={...a}

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: javascript j

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Contributed on Jul 23 2022

ap_Cooperative_dev

0 Answers Avg Quality 2/10

javascript spread operator

Comment

var num = [2, 4, 6, 8, 10];
console.log(...num)
//expected output: 2 4 6 8 10
console.log(88, ...num, 99)
//expected output: 88 2 4 6 8 10 99

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 03 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

javascript spread operator

Comment

var num = [2, 4, 6, 8, 10];
console.log(...num)
//expected output: 2 4 6 8 10
console.log(88, ...num, 99)
// added extra new elements before and after the spread operator
//expected output: 88 2 4 6 8 10 99

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 03 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

Javascript spread operator

Comment

var num = [2, 4, 6, 8, 10];
console.log(...num)
//expected output: 2 4 6 8 10
console.log(88, ...num, 99) 
// added extra new elements before and after the spread operator
//expected output: 88 2 4 6 8 10 99

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 03 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

spread js

Comment

const user = { name: 'user', password: 'user'}
const admin = { name 'admin', rights: 'root'}

let merge = Object.assign({}, user, admin) 
console.log(merge) 
// {name 'admin', password: 'user', rights: 'root'}

merge = {...user, ...admin} // spread operator
console.log(merge)
// {name 'admin', password: 'user', rights: 'root'}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 19 2022

Anton Grigoriev

0 Answers Avg Quality 2/10

javascript spread operator

Comment

var num = [2, 4, 6, 8, 10];
console.log(...num)
//expected output: 2 4 6 8 10
console.log(88, ...num, 99)
//expected output: 88 2 4 6 8 10 99

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 03 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

javascript Spread Operator

Comment

const arrValue = ['My', 'name', 'is', 'Jack'];

console.log(arrValue);   // ["My", "name", "is", "Jack"]
console.log(...arrValue); // My name is Jack

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: javascript j

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Contributed on May 21 2022

SAMER SAEID

0 Answers Avg Quality 2/10

js spread

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