Javascript delete loop

I have a school assignment and I have an issue with deleting something from an array of indexes. This is what I currently have.

Function that returns array length:

function DolzinaPolja(polje){   
    return polje.length-1;
}

new constructor

function oseba(ime, priimek, stranka) {
    this.ime=ime;
    this.priimek=priimek;
    this.stranka=stranka;
}

function that creates an object and pushes it into an array

function UstvariObjekt(ime,priimek, stranka) {
    if (ime.length == 0 || priimek.length == 0 || stranka.length == 0) {
        throw "Parametri niso popolni!";
    }
    else {
        var novaoseba=new oseba(ime, priimek, stranka);
        polje.push(novaoseba);
        console.log(novaoseba.ime, novaoseba.priimek, novaoseba.stranka);
    }
}

function that deletes an object from the array

function OdstraniIzPolja(x) {
    if(x > polje.length - 1 || x == polje.length) {
        throw"Polje ni tako veliko!";
    }
    for(var i=0; i<=polje.length-1;i++) {
        if(x==polje[i]) {
            polje.splice(x,1);
            return true;
        }
        return false;
    }
}

I am having an issue with deleting an object from the array. Here are my tests.

var polje = [];
var x=0;

UstvariObjekt("Rene","Vucko","Stranka");
UstvariObjekt("R","V","S");
UstvariObjekt("X","Y","Z");

OdstraniIzPolja(x);
console.log(polje[0]);
console.log(polje[1]);
console.log(polje[2]);
console.log(DolzinaPolja(polje));

SO my array should be the length of 2. Since I start with 0,1,2. What I don't understand is why doesn't my function that deletes an object from the array delete the object? I've played around a little bit but often it just deletes the wrong object.

Also is the if clause for x if the length is smaller than the array length written ok?

---UPDATE---- IF I write polje.slice(2,1) without the function just in the program, it deletes the right one. So obviously something is wrong with the loop. This is my updated code.

function DolzinaPolja(polje){   
    return polje.length-=1;
}

function OdstraniIzPolja(x)
{
    if(x>polje.length-1 || x==polje.length)
    {
        throw"Polje ni tako veliko!";
    }
    for(var i=polje.length-1;i>=0;i--)
    {
        if(x==polje[i]){
        polje.splice(i,1);
        return true;
        }
        return false;
    }
}

--EDIT-- here's the code https://jsfiddle.net/2y07wtkL/