Question

I have five star rating and average score.

1. Average score is float number
2. Five star rating just 10 section, one star have two half star (so 10 section is five star)

Ex:

Average score is: from 0 - 5 (average = 4.658, or average = 0.256, 0 <= average <= 5)

Five star rating is 10 section: [0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5]

How to check and set average score to 10 section base on average score?

This is my code, it very long.

            var twofixed = Math.round(average * 100) / 100;           
            twofixed = Math.abs(twofixed);
            var decimal = twofixed - Math.floor(twofixed)

            twofixed = (twofixed + "").split(".");

            if(twofixed[0] == 0)
            {
                if(twofixed[1] == undefined) { average = 0; }
                else
                {
                    if(twofixed[1] <= 99)
                    {
                        average = 0.50;
                    }
                    else
                    {
                        average = 1;
                    }
                }
            }
            else if(twofixed[0] == 1)
            {
                if(twofixed[1] == undefined) { average = 1; }

                else
                {
                    if(twofixed[1] <= 99)
                    {
                        average = 1.50;
                    }
                    else
                    {
                        average = 2;
                    }
                }
            }
            else if(twofixed[0] == 2)
            {
                if(twofixed[1] == undefined) { average = 2; }
                else
                {
                    if(twofixed[1] <= 99)
                    {
                        average = 2.50;
                    }
                    else
                    {
                        average = 3;
                    }
                }
            }
            else if(twofixed[0] == 3)
            {
                if(twofixed[1] == undefined) { average = 3; }
                else
                {
                    if(twofixed[1] <= 99)
                    {
                        average = 3.50;
                    }
                    else
                    {
                        average = 4;
                    }
                }
            }
            else if(twofixed[0] == 4)
            {
                if(twofixed[1] == undefined) { status = 'Great'; average = 4; }
                else
                {
                    if(twofixed[1] <= 99)
                    {
                        average = 4.50;
                    }
                    else
                    {
                        average = 5;
                    }
                }                    
            }
            else if(twofixed[0] == 5)
            {
                if(twofixed[1] == undefined) { average = 5; }
            }

Big thanks to @th3falc0n with small code, I write more than 50 line of code, but you can do with one line of code to solve of my long code.

Thanks everyone to help me, and sorry for unclearly question and bad english

Answer 1

I think you just need

Math.floor(average * 2.0) / 2.0;

This code leaves only x.y from any float number.

Edit: I made a little mistake. I set it to 0.1 steps so it would make 0.85 to 0.8, that is fixed now (1/2.0) = 0.5 steps. You can use 4.0 for 0.25 steps 10.0 for 0.1 and so on.