How to add a element to an array inside another array

Question

Here is my situation. I have the following array.

arrParent = [[List1,A,B,C],[List2,E,F,G,H]];
arrChild1 = [List1,A,B,C];
arrChild2 = [List2,E,F,G,H];

I want to add "D" to the end of arrChild1. I am having difficulty targeting the child array in my javascript.

I am using:

arrParent[0].push("D")

...but the result is not what I want. The result I get is:

arrChild[(List1,A,B,C),D];

I can verify this my calling:

console.log(arrChild1[0] (which displays List1,A,B,C)
console.log(arrChild1[1] (which displays D)

I need:

arrChild1[0] = List1
arrChild1[1] = A
arrChild1[2] = B
arrChild1[3] = C
arrChild1[4] = D

Can someone point me in the right direction? Thanks in advance.

Are you sure you don't have arrChild1 = [[List1, A, B, C]]? — Andrew Li
– Andrew Li, Commented Aug 11, 2017 at 20:29
Your code should work. Can you try to find more depth in your problem? — Ivan Drinchev
– Ivan Drinchev, Commented Aug 11, 2017 at 20:33
I have test this var arrParent = [['List1','A','B','C'],['List2','E','F','G','H']]; arrParent[0].push('D'); console.log(arrParent[0]); The result was as expected: ["List1", "A", "B", "C", "D"] — Jan Franta
– Jan Franta, Commented Aug 11, 2017 at 20:35
To all: Thanks for looking at this. While I don't have the answer just yet I have narrowed the cause to be how the array is being dynamically created using .push() in other functions. I need to look at them. — MarkL
– MarkL, Commented Aug 11, 2017 at 20:53

Aquila Sagitta · Accepted Answer · 2017-08-11 20:39:42Z

1

var foo = [1,2,3]; // access like: foo[0] === 1

var bar = [foo, [4,5,6]];
var baz = bar[0]; // baz[0] === 1 same as foo[0]

//so to access an array within array
var fuz = bar[0][0]; // fuz === 1

answered Aug 11, 2017 at 20:39

Aquila Sagitta

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