Declare an string array inside a int array in Solidity

Question

I am using truffle and I am trying to pass during the deployment execution script a double array of prices inside my contract's constructor. ie

In the migration file I have a 2 dimensional array. It's nested array contains a pair of prices.

var prices = [
  ['1223.456', '1223.456'],
  ['123.46', '12.1']
];

contract A {

   struct Price {
        string Price0;
        string Price1;
    }

    mapping (uint => Price) prices;

    constructor (int[][] memory _prices) public
    {

        for(uint i=0; i< _prices.length; i++) 
        {

          prices[i] = Price(
              _prices[i][0],
              _prices[i][1]
          );

        }
    }
}

How can I declare this inside my contract's constructor so that I can parse it right after? What I saw so far is that I can declare a 2 dimensional array with the same type ie

uint[][] prices;
// or
string[][] prices;

but these are not working since in my double array the 1-level key is of type integer and the value of the 2-level is of type string.

Answer 1

Try this:

constructor(string[] memory _prices0, string[] memory _prices1) public {
    uint256 length = _prices0.length;
    require(length == _prices1.length, "invalid input length");
    for (uint256 i = 0; i < length; i++) {
        prices[i] = Price({
            Price0: _prices0[i],
            Price1: _prices1[i]
        });
    }
}

Then, from JS, you can call it with:

var prices0 = ['1223.456', '123.46'];
var prices1 = ['1223.456', '12.1'];