Add wordWrap

snippets/wordWrap.md

@@ -0,0 +1,20 @@
+---
+title: wordWrap
+tags: string,regexp,intermediate
+---
+
+Wraps a string to a given number of characters using a string break character.
+
+- Use `String.prototype.replace()` and a regular expression to insert a given break character at the nearest whitespace of `max` characters.
+- Omit the third argument, `br`, to use the default value of `'\n'`.
+
+```js
+const wordWrap = (s, max, br = '\n') => s.replace(
+    new RegExp(`(?![^\\n]{1,${max}}$)([^\\n]{1,${max}})\\s`, 'g'), '$1' + br
+);
+```
+
+```js
+wordWrap('Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce tempus.', 32) // 'Lorem ipsum dolor sit amet,\nconsectetur adipiscing elit.\nFusce tempus.'
+wordWrap('Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce tempus.', 32, '\r\n') // 'Lorem ipsum dolor sit amet,\r\nconsectetur adipiscing elit.\r\nFusce tempus.'
+```