Solidity difference array with and without new keyword

Question

I have seen two ways to create arrays.

without new keyword: bool[3] fixedArray;

with new keyword: bool[] fixedArray2 = new bool[](3);

Can someone explain the difference between these two types?

Answer 1

Creating arrays with variable length in memory can be done using the new keyword. As opposed to storage arrays, it is not possible to resize memory arrays by assigning to the .length member.

pragma solidity ^0.4.16;


contract C {

    function f(uint len) public pure {

        uint[] memory a = new uint[](7);

        bytes memory b = new bytes(len);

        // Here we have a.length == 7 and b.length == len

        a[6] = 8;

    }

}

Source: Solidity docs