30-seconds-of-code/snippets/wordWrap.md

title, tags

title	tags
wordWrap	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'.

const wordWrap = (str, max, br = '\n') => str.replace(
  new RegExp(`(?![^\\n]{1,${max}}$)([^\\n]{1,${max}})\\s`, 'g'), '$1' + br
);

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.'