mirror of
https://github.com/alrayyes/wiki.git
synced 2024-11-22 11:36:23 +00:00
19 lines
240 B
Markdown
19 lines
240 B
Markdown
|
---
|
||
|
|
id: 40929849-a8dc-4293-8e24-afa2ff04620d
|
||
|
|
title: TypeScript strictNullChecks
|
||
|
|
---
|
||
|
|
|
||
|
|
# Description
|
||
|
|
|
||
|
|
Check if variable is null
|
||
|
|
|
||
|
|
# Syntax
|
||
|
|
|
||
|
|
``` typescript
|
||
|
|
function foo(a?: number | null) {
|
||
|
|
if (a == null) return;
|
||
|
|
|
||
|
|
// a is number now.
|
||
|
|
}
|
||
|
|
```
|