Create a new fixed size array in solidity

Question

What is the difference between the below two array?

without new keyword: bool[3] fixedArray;

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

Answer 1

The new keyword is used to initialise arrays in memory. From the docs:

Allocating Memory Arrays

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;
    }
}