 # How to Check if a Number is a Float in JavaScriptself.__wrap_n=self.__wrap_n||(self.CSS&&CSS.supports("text-wrap","balance")?1:2);self.__wrap_b=(e,r,t)=>{t=t||document.querySelector(`[data-br="\${e}"]`);let o=t.parentElement,a=s=>t.style.maxWidth=s+"px";t.style.maxWidth="";let n,i=o.clientWidth,l=o.clientHeight,c=i/2-.25,g=i+.5;if(i){for(a(c),c=Math.max(t.scrollWidth,c);c+1<g;)n=Math.round((c+g)/2),a(n),o.clientHeight===l?g=n:c=n;a(g*r+i*(1-r))}t.__wrap_o||typeof ResizeObserver<"u"&&(t.__wrap_o=new ResizeObserver(()=>{self.__wrap_b(0,+t.dataset.brr,t)})).observe(o)};self.__wrap_n!=1&&self.__wrap_b(":R2a9m:",1)

November 8, 2023

In order to determine if a number if a float in JavaScript, you need to understandthe nature of number representation in the language. Since JavaScript uses IEEE 754 standard for floating-point arithmetic, integers and floats are not distinct types. But there are techniques to differentiate them. We’ll cover them below.

## Understanding number representation in JavaScript

In JavaScript, numbers are represented as double-precision 64-bit binary format IEEE 754 values, which means that both integers and floating-point numbers are treated as the same type. This can make it challenging to determine if a number is an integer or a float, as they are not inherently distinguished.

## Using the `Number` object and `parseInt`

The `Number` object provides methods that can be used to inspect the characteristics of numeric values. One approach to check if a number is a float is to compare it with its integer part obtained using `parseInt`.

```function isFloat(n) {
return Number(n) === n && n % 1 !== 0;
}```

## Leveraging `parseFloat` and strict comparison

Alternatively, `parseFloat` can be used to ensure the number remains the same when its floating-point representation is parsed from a string. Strict comparison to the original number then reveals its type.

```function isFloat(n) {
return parseFloat(n) === n && !Number.isInteger(n);
}```

## Utilizing `Math.floor` or `Math.ceil`

Mathematical functions like `Math.floor` or `Math.ceil` can also be used to check for float numbers by comparing the original number with the result of the floor or ceil operation.

```function isFloat(n) {
return Math.floor(n) !== n;
}```

## Employing `Number.isInteger`

A straightforward method provided by ES6 is `Number.isInteger`, which directly checks if a number is an integer, hence its negation would imply a float.

```function isFloat(n) {
return !Number.isInteger(n);
}```

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