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. — newelski
– newelski, Commented Sep 14, 2017 at 5:07
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
– Teemu, Commented Sep 14, 2017 at 5:07
I'm sure you can create the nested loops needed for task without any example. — Teemu
– Teemu, Commented Sep 14, 2017 at 5:10

Lucas Hendren · Accepted Answer · 2017-09-14 05:53:49Z

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, 2017 at 5:53

answered Sep 14, 2017 at 5:08

Lucas Hendren

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4 Comments

Lucas Hendren Over a year ago

sorry i meant java script, fixing

Patrick Roberts Over a year ago

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 Over a year ago

@Legman why there is no semi colon at the line 3? myArr[0][0] = new Array()

Lucas Hendren Over a year ago

Typo, it has been fixed

Jigar Shah · Accepted Answer · 2017-09-14 05:10:16Z

0

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]);

answered Sep 14, 2017 at 5:10

Jigar Shah

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