Ethereum Cookbook

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Yul (previously JULIA) is a new language that can be used for writing inline assembly code. This is an intermediate language that can compile to various backends, such as EVM and eWASM (upcoming). The components of Yul include functions, blocks, variables, literals, for loops, if and switch statements, and assignments.

Here's the power function explained in step 7, rewritten in the Yul language:

function power2(x:u256, y:u256) -> result:u256{    switch y    case 0:u256 { result := 1:u256 }    case 1:u256 { result := x }    default:    {        result := power(mul(x, x), div(y, 2:u256))        switch mod(y, 2:u256)            case 1:u256 { result := mul(x, result) }    }}

The supported data types in Yul are bool, u8, s8, u32, s32, u64, s64, u128, s128, u256, and s256 ...