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Angelos Chalaris
2020-09-15 16:28:04 +03:00
parent 040efd4380
commit 53c16dbf65
401 changed files with 969 additions and 950 deletions
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6
snippets/isNumber.md
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@ -5,8 +5,8 @@ tags: type,math,beginner
Checks if the given argument is a number.
Use `typeof` to check if a value is classified as a number primitive.
To safeguard against `NaN`, check if `val === val` (as `NaN` has a `typeof` equal to `number` and is the only value not equal to itself).
- Use `typeof` to check if a value is classified as a number primitive.
- To safeguard against `NaN`, check if `val === val` (as `NaN` has a `typeof` equal to `number` and is the only value not equal to itself).
```js
const isNumber = val => typeof val === 'number' && val === val;
@ -16,4 +16,4 @@ const isNumber = val => typeof val === 'number' && val === val;
isNumber(1); // true
isNumber('1'); // false
isNumber(NaN); // false
```
```