JavaScript
doesn’t support true multi dimensional arrays like other langauges. Suppose if
you want to define an array of 10X10 you need to erite your logic like below.
var arr =
new Array(10);
for(var
i=0; i<arr.length; i++){
arr[i] = new Array(10);
}
arrays.html
<!DOCTYPE html> <html> <head> <title>Multi Dimensional Arrays</title> </head> <body> <script type="text/javascript"> var arr = new Array(10); for (var i = 0; i < arr.length; i++) { arr[i] = new Array(10); } /* Define Array */ for (var i = 0; i < arr.length; i++) { for (var j = 0; j < arr[i].length; j++) { arr[i][j] = (i + 1) * (j + 1); } } /* display Array */ for (var i = 0; i < arr.length; i++) { for (var j = 0; j < arr[i].length; j++) { document.write(arr[i][j] + " "); } document.write("<br />"); } </script> </body> </html>
Open above
page in browser, you can able to see following text.
1 2 3 4 5
6 7 8 9 10
2 4 6 8 10
12 14 16 18 20
3 6 9 12
15 18 21 24 27 30
4 8 12 16
20 24 28 32 36 40
5 10 15 20
25 30 35 40 45 50
6 12 18 24
30 36 42 48 54 60
7 14 21 28
35 42 49 56 63 70
8 16 24 32
40 48 56 64 72 80
9 18 27 36
45 54 63 72 81 90
10 20 30
40 50 60 70 80 90 100
Unlike
other languages, it is not necessary all the columns should have same length in
multi dimensional array.
var arr =
new Array(10);
for(var
i=0; i<arr.length; i++){
arr[i] = new Array(i+1);
}
As you see
above snippet,
arr[0] has length 1
arr[1] has length 2
arr[2]
has length 3 etc.,
arrays.html
<!DOCTYPE html> <html> <head> <title>Multi Dimensional Arrays</title> </head> <body> <script type="text/javascript"> var arr = new Array(10); for (var i = 0; i < arr.length; i++) { arr[i] = new Array(i + 1); } var counter = 1; /* Define Array */ for (var i = 0; i < arr.length; i++) { for (var j = 0; j < arr[i].length; j++) { arr[i][j] = counter++; } } /* display Array */ for (var i = 0; i < arr.length; i++) { for (var j = 0; j < arr[i].length; j++) { document.write(arr[i][j] + " "); } document.write("<br />"); } </script> </body> </html>
Open above
page in browser, you can able to see following text.
1
2 3
4 5 6
7 8 9 10
11 12 13
14 15
16 17 18
19 20 21
22 23 24
25 26 27 28
29 30 31
32 33 34 35 36
37 38 39
40 41 42 43 44 45
46 47 48
49 50 51 52 53 54 55
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