how define array of array?

[Geoff Cox]

Hello,

This may be the answer to a problem I have - or it may not be
possible?!

Can I have initial values of variable situation and count defined as

var situation = 0;
var count = 0;

when during the app situation will vary from 0 to 7 and count from 0
to 8,

and have

value[situation][count] ?

If yes, how do I define the array if arrays?

Thanks

Geoff

 

[Baconbutty]

In Javascript Arrays are "flat", so to make multiple dimensions, you
create an Array as an item of another Array, thus:-

// AN ARRAY CAN BE AN ELEMENT OF ANOTHER ARRAY
var value=new Array();
value[0]=new Array();
value[0][0]="value00";
value[0][1]="value01";
value[1]=new Array();
value[1][0]="value10";
value[1][1]="value11";
alert (value[0][1]);


// SHORTHAND JSON NOTATION
var value=[]; // SAME AS var value=new Array

// EQUIVALENT TO THE ABOVE
var value=[ ["value00","value01"] , ["value10","value11"] ];
alert (value[0][1]);

 

[Dag Sunde]

Hello,

This may be the answer to a problem I have - or it may not be
possible?!

Can I have initial values of variable situation and count defined as

var situation = 0;
var count = 0;

when during the app situation will vary from 0 to 7 and count from 0
to 8,

and have

value[situation][count] ?

If yes, how do I define the array if arrays?

Thanks

var value = new Array(8);
for (var n = 0; n < value.length; n++ ) {
value[n] = new Array(9);
}

 

[Geoff Cox]

In Javascript Arrays are "flat", so to make multiple dimensions, you
create an Array as an item of another Array, thus:-

// AN ARRAY CAN BE AN ELEMENT OF ANOTHER ARRAY
var value=new Array();
value[0]=new Array();
value[0][0]="value00";
value[0][1]="value01";
value[1]=new Array();
value[1][0]="value10";
value[1][1]="value11";
alert (value[0][1]);


// SHORTHAND JSON NOTATION
var value=[]; // SAME AS var value=new Array

// EQUIVALENT TO THE ABOVE
var value=[ ["value00","value01"] , ["value10","value11"] ];
alert (value[0][1]);

Thanks for this - perhaps you could see my last posting to Dag and
comment?

Cheers

Geoff

 

[Baconbutty]

Arrays do not need to have the length specified. The "length" will be
one more than the last integer index (i.e. counting index position 0).

Thus:-

var a=new Array();
a[10]="Item11";
alert(a.length); // 11 even though 0 - 9 are undefined

Hence what is important is populating those arrays, not declaring them,
as it is only when you populate them that items are effectively
created.

If you search this group for words such as Array, Hash, [[PUT]] and
writings from those such as Richard Cornford, Michael Winter etc there
is a lot of technical information (and argument) about the ECMA Array
object which you may find helpful.

 

[Geoff Cox]

Arrays do not need to have the length specified. The "length" will be
one more than the last integer index (i.e. counting index position 0).

Thus:-

var a=new Array();
a[10]="Item11";
alert(a.length); // 11 even though 0 - 9 are undefined

Hence what is important is populating those arrays, not declaring them,
as it is only when you populate them that items are effectively
created.

If you search this group for words such as Array, Hash, [[PUT]] and
writings from those such as Richard Cornford, Michael Winter etc there
is a lot of technical information (and argument) about the ECMA Array
object which you may find helpful.

Thanks for above and text from others ..

Cheers

Geoff