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19 lines
240 B
Markdown
19 lines
240 B
Markdown
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---
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id: 40929849-a8dc-4293-8e24-afa2ff04620d
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title: TypeScript strictNullChecks
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---
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# Description
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Check if variable is null
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# Syntax
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``` typescript
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function foo(a?: number | null) {
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if (a == null) return;
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// a is number now.
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}
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```
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