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

• newelski: 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.
• Teemu: 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.
• belldiaz: @Teemu : Can you show me how to do it?
• Teemu: I'm sure you can create the nested loops needed for task without any example.

Answer 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";

• Lucas Hendren: sorry i meant java script, fixing
• Patrick Roberts: 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).
• belldiaz: @Legman why there is no semi colon at the line 3? myArr[0][0] = new Array()
• Lucas Hendren: Typo, it has been fixed

Answer 2

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]);