The best answers to the question “Get decimal portion of a number with JavaScript” in the category Dev.

__QUESTION__:

I have float numbers like `3.2`

and `1.6`

.

I need to separate the number into the integer and decimal part. For example, a value of `3.2`

would be split into two numbers, i.e. `3`

and `0.2`

Getting the integer portion is easy:

```
n = Math.floor(n);
```

But I am having trouble getting the decimal portion.

I have tried this:

```
remainder = n % 2; //obtem a parte decimal do rating
```

But it does not always work correctly.

The previous code has the following output:

```
n = 3.1 // gives remainder = 1.1
```

What I am missing here?

__ANSWER__:

```
var decimal = n - Math.floor(n)
```

Although this won’t work for minus numbers so we might have to do

```
n = Math.abs(n); // Change to positive
var decimal = n - Math.floor(n)
```

__ANSWER__:

Use `1`

, not `2`

.

```
js> 2.3 % 1
0.2999999999999998
```

__ANSWER__:

How is 0.2999999999999998 an acceptable answer? If I were the asker I would want an answer of .3. What we have here is false precision, and my experiments with floor, %, etc indicate that Javascript is fond of false precision for these operations. So I think the answers that are using conversion to string are on the right track.

I would do this:

```
var decPart = (n+"").split(".")[1];
```

Specifically, I was using 100233.1 and I wanted the answer “.1”.

__ANSWER__:

You could convert to string, right?

```
n = (n + "").split(".");
```