Create Three dimensional array and assign value to it in Javascript

Question

I have tried to create 3 dimensional array and assigning value to it, base on the answer here creating and parsing a 3D array in javascript? .

var myArr = new Array(new Array(new Array()));

myArr[0][0][0] = "1";
myArr[0][0][1] = "2";
myArr[0][1][0] = "2";
myArr[0][1][1] = "2";
myArr[0][2][0] = "3";
myArr[0][2][1] = "4";

but I get this

Uncaught Typeerror: Cannot set propterty '0' of undefined".

Need some help.

Thank you

The problem here is that `var myArr = new Array(new Array(new Array()));` translates to `myArr[0][0] = [ ]` meaning that when trying to access `myArr[0][1]` you get an undefined object, since in fact, you never created an array at that index. — mnewelski, Sep 14 '17 at 05:07
There are no multidimensional arrays in JS, you can only emulate them with nested arrays. This means, that you've to define every member separately as a subarray. — Teemu, Sep 14 '17 at 05:07
I'm sure you can create the nested loops needed for task without any example. — Teemu, Sep 14 '17 at 05:10

Lucas Hendren · Answer 1 · 2017-09-14T05:53:49.107

1

There are no initiating variables in advance in javascript and the compilation step simply hoists top-level variable and function definitions, and in ES6, does static importing and exporting (though that's not yet natively supported)[Patrick Roberts]. One additional option is

var myArr = new Array();
myArr[0] = new Array();
myArr[0][0] = new Array();
myArr[0][0][0] = "1";
myArr[0][0][1] = "2";
myArr[0][1] = new Array();
myArr[0][1][0] = "2";
myArr[0][1][1] = "2";
myArr[0][2] = new Array();
myArr[0][2][0] = "3";
myArr[0][2][1] = "4";

edited Sep 14 '17 at 05:53

answered Sep 14 '17 at 05:08

Lucas Hendren

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sorry i meant java script, fixing – Lucas Hendren Sep 14 '17 at 05:10
1

Technically there is a compile-time, since it's a JIT compiled language. The compilation step simply hoists top-level variable and function definitions, and in ES6, does static importing and exporting (though that's not yet natively supported). – Patrick Roberts Sep 14 '17 at 05:31
1

@Legman why there is no semi colon at the line 3? myArr[0][0] = new Array() – belldiaz Sep 14 '17 at 05:49
Typo, it has been fixed – Lucas Hendren Sep 14 '17 at 05:54

score 0 · Answer 2 · answered Sep 14 '17 at 05:10

You can do like this (but creating 3d array in javascript is more completed stuff. Please consider changing your approach to handle data):

var myArr = new Array();
myArr[0] = new Array();
myArr[0][0] = new Array();
myArr[0][0][0] = "1";
myArr[0][0][1] = "2";
myArr[0][1] = new Array();
myArr[0][1][0] = "2";
myArr[0][1][1] = "2";
myArr[0][2] = new Array();
myArr[0][2][0] = "3";
myArr[0][2][1] = "4";

console.log(myArr[0][2][0]);

Create Three dimensional array and assign value to it in Javascript

2 Answers2