Ethereum Cookbook

Arrays

Follow these steps to create arrays in solidity and to perform read/write operations:

1. Arrays can be created with a fixed or dynamic length. Arrays can also hold user-defined types:

uint[10] numbers;struct Person {    uint id;    string name;}Person[] candidates;

2. The creation of multidimensional arrays is supported by solidity:

// array of 3 dynamic arrays of boolbool[][3] table;

Note that the index value is reversed when compared with other languages. For example, to access the first element in the third array, you use a[2][0]:

3. Arrays have a length parameter to store the number of elements in the array. Changing the length parameter of dynamic storage arrays can resize the arrays:

contract test {    address[] contributors; function donate() ...