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20 lines
395 B
Markdown
20 lines
395 B
Markdown
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---
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id: 64df7704-1f31-4da6-95f3-2747a031fbf9
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title: Nullish coalescing operator (??)
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---
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# Description
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Returns right-hand side operand when it's left-hand side operand is
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`null` or `undefined`, and otherwise returns its left-hand side operand.
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# Syntax
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``` javascript
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const foo = null ?? 'default string';
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console.log(foo); // default string
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const baz = 0 ?? 42;
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console.log(baz); // 0
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```
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