Remove specific element from json array

Question

i declarate a JSON like this

var json{
section1: [],
section2: [],
section3: []
}

i want to remove a specific item of this way or something like

json[section][index].remove();

i tried with this way

 delete json[section][index];

but when i do this the array elements don't rearrange

You can use splice() to remove an item from an array. --> stackoverflow.com/questions/5767325/… — daddygames
– daddygames, Commented Aug 14, 2019 at 17:41
If you just want to delete a specific property based on a number called index, you could do delete json["section"+index] — adiga
– adiga, Commented Aug 14, 2019 at 18:20

claasic · Accepted Answer · 2019-08-14 17:42:12Z

2

Arrays don't have an remove function. Use splice instead:

var data = {section1: [1,2,3,4]};

const remove = (arr, key, index) => arr[key].splice(index,1)

remove(data,"section1",2)

console.log(data)

Keep in mind that this actually changes the original array.

answered Aug 14, 2019 at 17:42

claasic

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Steve0 · Accepted Answer · 2019-08-14 17:40:25Z

0

slice() is your friend.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice

json[section] = json[section].slice(index,index+1);

answered Aug 14, 2019 at 17:40

Steve0

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3 Comments

claasic Over a year ago

Slice will return a shallow copy (in this case of a single element of the array). You won't change the original array, you won't return any kind of changed array. Did you mix up slice with splice?

Steve0 Over a year ago

Admittedly it was unclear in the question if the array that they were manipulating was more than a simple array. @assoron, your answer is better anyway. I will leave this one here for completeness I guess.

Johnatan De Leon Over a year ago

I use the slice to remove the element. i did something like this: json[place].splice(position, 1); Thanks!

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