30 lines
861 B
Markdown
30 lines
861 B
Markdown
---
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title: wordWrap
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tags: string,regexp,intermediate
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---
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Wraps a string to a given number of characters using a string break character.
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- Use `String.prototype.replace()` and a regular expression to insert a given break character at the nearest whitespace of `max` characters.
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- Omit the third argument, `br`, to use the default value of `'\n'`.
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```js
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const wordWrap = (str, max, br = '\n') => str.replace(
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new RegExp(`(?![^\\n]{1,${max}}$)([^\\n]{1,${max}})\\s`, 'g'), '$1' + br
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);
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```
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```js
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wordWrap(
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'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce tempus.',
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32
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);
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// 'Lorem ipsum dolor sit amet,\nconsectetur adipiscing elit.\nFusce tempus.'
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wordWrap(
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'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce tempus.',
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32,
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'\r\n'
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);
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// 'Lorem ipsum dolor sit amet,\r\nconsectetur adipiscing elit.\r\nFusce tempus.'
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```
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