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Get Length of a 2D Array in Javascript

how to get the dimensions of a 2d array in java

public class Main {
  public static void main(String[] args) {
    int[][] test = new int[10][4];
    int rows = test.length;
    int coloumns = test[0].length;

JS get 2d array row count

var air = [
	['dragonfly', 'crane fly'],
	['eagle', 'falcon'],
	['jumbo jet','harrier'],
	['mosquito', 'wasp']

alert(air.length); // 4


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