Answer by LmC for How do I check if an array includes a value in JavaScript?

function inArray(elem,array)
{
    var len = array.length;
    for(var i = 0 ; i < len;i++)
    {
        if(array[i] == elem){return i;}
    }
    return -1;
} 

Returns array index if found, or -1 if not found