23 lines
574 B
Markdown
23 lines
574 B
Markdown
---
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title: Truncate string
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tags: string
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expertise: beginner
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cover: blog_images/bamboo-lamp.jpg
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firstSeen: 2017-12-17T17:55:51+02:00
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lastUpdated: 2020-10-21T21:17:45+03:00
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---
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Truncates a string up to a specified length.
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- Determine if `String.prototype.length` is greater than `num`.
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- Return the string truncated to the desired length, with `'...'` appended to the end or the original string.
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```js
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const truncateString = (str, num) =>
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str.length > num ? str.slice(0, num > 3 ? num - 3 : num) + '...' : str;
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```
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```js
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truncateString('boomerang', 7); // 'boom...'
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```
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