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how to copy a javascript array

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Exuberant Eland answered on July 23, 2019 Popularity 10/10 Helpfulness 3/10

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how to copy a javascript array

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let arr = ["jason", "james", "jelani"];
let arrCopy = arr.slice();
//Note that this is "slice" and not "splice". 
//arr.splice() would be very different!

console.log(arrCopy);//["jason", "james", "jelani"]

//Makes deep copy
arrCopy[0] = "jamil";
console.log(arr); //["jason", "james", "jelani"]
console.log(arrCopy);//["jamil", "james", "jelani"]

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: copy javascript

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Contributed on Dec 06 2021

Exuberant Eland

0 Answers Avg Quality 2/10

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javascript copy an array

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let arr =["a","b","c"];
// ES6 way
const copy = [...arr];

// older method
const copy = Array.from(arr);

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: copy

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Contributed on Jul 02 2020

Batman

0 Answers Avg Quality 2/10

copy array javascript

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const sheeps = ['Apple', 'Banana', 'Juice'];

// Old way
const cloneSheeps = sheeps.slice();

// ES6 way
const cloneSheepsES6 = [...sheeps];

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: www.samanthaming.com

Tags: copy

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Contributed on Apr 29 2020

Panzer

0 Answers Avg Quality 2/10

javascript copy array

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var numbers = [1,2,3,4,5];
var newNumbers = Object.assign([], numbers);

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: copy

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Contributed on Apr 09 2020

Beautiful Bear

0 Answers Avg Quality 2/10

javascript copy array

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var oldColors=["red","green","blue"];
var newColors = oldColors.slice(); //make a clone/copy of oldColors

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 23 2019

Grepper

0 Answers Avg Quality 2/10

javascript copy array

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// this is for array with complex object
var countries = [
  {name: 'USA', population: '300M'}, 
  {name: 'China', population: '1.6B'}
];

var newCountries = JSON.parse(JSON.stringify(countries));

Popularity 10/10 Helpfulness 4/10 Language javascript

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Tags: copy

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Contributed on Apr 09 2020

Beautiful Bear

0 Answers Avg Quality 2/10

copy an array

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// Copy an array
fn main() {
    let arr = ["a","b","c"];
    let mut another = arr.clone();  // make a copy
    println!("copy of arr = {:?} ", another);
    another[1] = "d";          // make a change
    assert_eq!(arr, another);  // panic, no longer equal
}

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Contributed on Sep 30 2021

Mackerel

0 Answers Avg Quality 2/10

Copy an Array

Comment

let shallowCopy = fruits.slice() // this is how to make a copy
// ["Strawberry", "Mango"]

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: developer.mozilla.org

Tags: copy

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Contributed on Jul 02 2021

Ronnie

0 Answers Avg Quality 2/10

how to copy a javascript array

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