jeena/en.javascript.info
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

minor fixes

Browse source
This commit is contained in:
Ilya Kantor 2022-01-21 10:45:48 +03:00
parent eb23b2d7b8
commit d5128182a5
2 changed files with 9 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

8
1-js/02-first-steps/05-types/article.md
View file

@ -46,13 +46,15 @@ Besides regular numbers, there are so-called "special numeric values" which also
alert( "not a number" / 2 ); // NaN, such division is erroneous
```
`NaN` is sticky. Any further operation on `NaN` returns `NaN`:
`NaN` is sticky. Any further mathematical operation on `NaN` returns `NaN`:
```js run
alert( "not a number" / 2 + 5 ); // NaN
alert( NaN + 1 ); // NaN
alert( 3 * NaN ); // NaN
alert( "not a number" / 2 - 1 ); // NaN
```
So, if there's a `NaN` somewhere in a mathematical expression, it propagates to the whole result.
So, if there's a `NaN` somewhere in a mathematical expression, it propagates to the whole result (there's only one exception to that: `NaN ** 0` is `1`).
```smart header="Mathematical operations are safe"
Doing maths is "safe" in JavaScript. We can do anything: divide by zero, treat non-numeric strings as numbers, etc.