Adding the codefunction to .zshrc file:

function code {
    if [[ $# = 0 ]]
    then
        open -a "Visual Studio Code"
    else
        local argPath="$1"
        [[ $1 = /* ]] && argPath="$1" || argPath="$PWD/${1#./}"
        open -a "Visual Studio Code" "$argPath"
    fi
}

hen from Terminal you can type:

code – opens Visual Studio Code
code . – opens current directory in Visual Studio Code
code somefile – opens somefile in Visual Studio Code