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snippets/js/s/truncate-string.md

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+---
+title: Truncate string
+type: snippet
+language: javascript
+tags: [string]
+cover: bamboo-lamp
+dateModified: 2020-10-21T21:17:45+03:00
+---
+
+Truncates a string up to a specified length.
+
+- Determine if `String.prototype.length` is greater than `num`.
+- Return the string truncated to the desired length, with `'...'` appended to the end or the original string.
+
+```js
+const truncateString = (str, num) =>
+  str.length > num ? str.slice(0, num > 3 ? num - 3 : num) + '...' : str;
+```
+
+```js
+truncateString('boomerang', 7); // 'boom...'
+```