for(let i=0;i<10;i++)
{
    console.log("hello" +i);

}

---------------------------------------------------------------------------------

for(let i=0;i<10;i=i+2)
{
    console.log("hello" +i);
}

---------------------------------------------------------------------------------

for(let i=0;i<10;i=i+2)
{
    i++;
    console.log("hello" +i);
}
---------------------------------------------------------------------------------

for ( let i = 10;i>=0 ;i--)
{
    if( i ==0)
    {
        alert('START')
    }
    else{
        alert("Odliczanie " +i)
    }
}

---------------------------------------------------------------------------------

for(let i = 0; i<=10; i++)
{
    console.log(Math.floor(Math.random()*100))
}