How can you add a row at a specific index in a multi-dimensional array using Javascript?

Question

How can you add a row at a specific index in a multi-dimensional array using Javascript?

Hey there, I'm a beginner in JavaScript programming and could really use some guidance!

Check out this 3D array with dimensions 2 x 3 x 3:

"items": [ [ [1,2,3], [4,5,6], [7,8,9] ], [ [10,11,12], [13,14,15], [16,17,18] ] ]

My task is to add a new row like

[ [19,20,21], [22,23,24], [25,26,27] ]

at either index 1 or 2.

I attempted to use the splice function but had no luck.

Since it's a multi-dimensional array, I'm unsure what should be placed in the itemN parameter of the splice function.

items.splice(insertIndex, 0, `????`);

Any advice on how to achieve this? Thank you!

javascript arrays multidimensional-array

Answer 1

Answer №1

To add a two-dimensional array to another array at a specific index position, you can use the splice method with a delete count of 0 as the second parameter. The third parameter should be the two-dimensional array that you want to add.

var items = [ [ [1,2,3], [4,5,6], [7,8,9] ], [ [10,11,12], [13,14,15], [16,17,18] ] ];
var add = [ [19,20,21], [22,23,24], [25,26,27] ];
items.splice(insertIndex, 0, add);

You can see a working example here.

Answer 2

To add a two-dimensional array to another array at a specific index position, you can use the splice method with a delete count of 0 as the second parameter. The third parameter should be the two-dimensional array that you want to add.

var items = [ [ [1,2,3], [4,5,6], [7,8,9] ], [ [10,11,12], [13,14,15], [16,17,18] ] ];
var add = [ [19,20,21], [22,23,24], [25,26,27] ];
items.splice(insertIndex, 0, add);

You can see a working example here.

Answer 3

Answer №2

To insert a complete array into the designated spot using splice, simply pass the entire array as a parameter, like so:

items.splice(2, 0,[ [19,20,21], [22,23,24], [25,26,27] ]);

Check out the DEMO here!

Answer 4

To insert a complete array into the designated spot using splice, simply pass the entire array as a parameter, like so:

items.splice(2, 0,[ [19,20,21], [22,23,24], [25,26,27] ]);

Check out the DEMO here!

Answer 5

Answer №3

This helpful solution has been accepted.

I created a demonstration for adding a middle row in Angular for reference purposes.

Sharing this information for those who may find it useful.

    textarray = [
        [{ text: "Content 1" }, { text: "Content 2" }],
        [{ text: "Content 3" }, { text: "Content 4" }]
      ];
      rowindex = 1;
      insertmiddle() {
        let size = this.textarray[0].length;
        this.textarray.splice(this.rowindex, 0, 
             Array(size).fill({ text: "Content", tag: "Content" }));
      }

Link to view the demo on StackBlitz

Answer 6

This helpful solution has been accepted.

I created a demonstration for adding a middle row in Angular for reference purposes.

Sharing this information for those who may find it useful.

    textarray = [
        [{ text: "Content 1" }, { text: "Content 2" }],
        [{ text: "Content 3" }, { text: "Content 4" }]
      ];
      rowindex = 1;
      insertmiddle() {
        let size = this.textarray[0].length;
        this.textarray.splice(this.rowindex, 0, 
             Array(size).fill({ text: "Content", tag: "Content" }));
      }

Link to view the demo on StackBlitz

How can you add a row at a specific index in a multi-dimensional array using Javascript?

Answer №1

Answer №2

Answer №3

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