3 posts tagged with "intermediate"

My last blog post about Bit Magic generated some buzz amongst fellow EVM developers and some of them reached out to me to include additional things in my blog related to using bits effectively in Solidity and the EVM in general.

Function Types​

For official documentations follow this link.

So, in Solidity, you can pass functions themselves as parameters to other functions. These type of parameters are called function types.

These function types can be used to pass and return functions from function calls.

Example​

1. Format of function types is the following:​

function (<parameter types>) {internal | external} [pure | view | payable] [returns(<return types>)]

Note : Function types can only be internal or external. Also, the return types cannot be empty if the function in question does not return anything, in this case, completely omit the returns keyword.

Bitwise Operations​

Includes all basic bitwise operations such as and, or, xor, not, shiftLeft, shiftRight etc.

uint x;
uint y;

x & y // and
x | y // or
x ^ y // xor
~x    // not
x << y // shift x by y bits to the left
x >> y // shift x by y bits to the right