Javascript compare 3 values

Question

I have 3 values that I want to compare f, g and h. I have some code to check that they all equal each other and that none of them are null. I\'ve had a look online but could

Answer 1

Add a distinct function to Array.prototype:

Array.prototype.distinct = function() {
    var result = [];
    for(var i = 0; i < this.length; i++) {
        if (result.indexOf(this[i]) == -1) {
            result.push(this[i]);
        }
    }
    return result; 
}

Then do:

var myArray = [f, g, h];
if (myArray.indexOf(null) == -1 && myArray.unique().length == 1)
{
    // no nulls and all elements have the same value!
}