JavaScript Array vs C# Array

Question

What type of array is this JavaScript Array shown? 1-dimensional, 2-dimensional or 3-dimensional? Also what will be the exact representation of this array in C#?

var arr = new Array ([34.01843, -118.491046], [34.006673, -118.486562], [34.009714, -118.480296], [34.010408, -118.473215], [34.01521, -118.474889], [34.022502, -118.480124],
            [34.024423, -118.459868], [34.024885, -118.44871], [34.002368, -118.482828], [34.003791, -118.473001], [34.015922, -118.457422], [34.022147, -118.457894],
            [34.028904, -118.46725], [34.030114, -118.481326], [34.03143, -118.494029], [34.031643, -118.504758], [34.029616, -118.515058], [34.001834, -118.451414]);

The datatypes of values in this array is double.

Array of items which are each arrays consisting of 2 doubles.. double[][] arr; — Sinatr
– Sinatr, Commented Dec 5, 2013 at 12:11
'double' isn't a JavaScript type. A JavaScript variable is not declared explicitly, it is inferred by the runtime. In your snippet the type will be inferred as 'Number' — John McNulty
– John McNulty, Commented Dec 5, 2013 at 12:16
As stated, the exact representation would be an array of arrays of doubles (double[][]), now it seems to me that you want to know something else otherwise you would not add the jquery tag. Do you want to know how to pass this type correctly to C# using jquery? — Natan
– Natan, Commented Dec 5, 2013 at 12:26

Marc Gravell · Accepted Answer · 2013-12-05 12:13:52Z

3

That is a jagged array, where each inner array is of length 2.

In C#, you could use:

var arr = new [] {
    new[]{34.01843, -118.491046}, new[]{34.006673, -118.486562}, new[]{34.009714, -118.480296},
    //...
};

which is a double[][]; however, you could also elect to use a double[,] instead (but it would have different semantics):

var arr = new [,] {
    {34.01843, -118.491046}, {34.006673, -118.486562}, {34.009714, -118.480296},
    //...
};

answered Dec 5, 2013 at 12:13

Marc Gravell

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spender · Accepted Answer · 2013-12-05 12:15:44Z

1

Well, technically, it doesn't have an "exact representation" in c#, and it depends on how the data is serialized and deserialized at each end.

I'd venture that something like List<Tuple<double,double>> would be a more appropriate datatype at the c# end.

answered Dec 5, 2013 at 12:15

spender

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2 Comments

Marc Gravell Over a year ago

Since in the js you can push to the inner items, and the inner items only have indexed access - I would argue that List<List<double>> would be closer

spender Over a year ago

Sure, but I'm working on the assumption that what's really being described is a list of pairs. I might be wrong.

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