16 lines
406 B
Markdown
16 lines
406 B
Markdown
### validateNumber
|
|
|
|
Returns `true` if the given value is a number, `false` otherwise.
|
|
|
|
Use `!isNaN` in combination with `parseFloat()` to check if the argument is a number.
|
|
Use `isFinite()` to check if the number is finite.
|
|
Use `Number()` to check if the coercion holds.
|
|
|
|
```js
|
|
const validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n) && Number(n) == n;
|
|
```
|
|
|
|
```js
|
|
validateNumber('10') // true
|
|
```
|