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truncateStringAtWhitespace javascript Code Snippet in 2024

stringintermediate

Last Updated: 27 October 2024

Truncates a string up to specified length, respecting whitespace when possible.

  • Determine if String.prototype.length is greater or equal to lim. If not, return it as-is.
  • Use String.prototype.slice() and String.prototype.lastIndexOf() to find the index of the last space below the desired lim.
  • Use String.prototype.slice() to appropriately truncate str based on lastSpace, respecting whitespace if possible and appending ending at the end.
  • Omit the third argument, ending, to use the default ending of '...'.
const truncateStringAtWhitespace = (str, lim, ending = '...') => { if (str.length <= lim) return str; const lastSpace = str.slice(0, lim - ending.length + 1).lastIndexOf(' '); return str.slice(0, lastSpace > 0 ? lastSpace : lim - ending.length) + ending; };
truncateStringAtWhitespace('short', 10); // 'short' truncateStringAtWhitespace('not so short', 10); // 'not so...' truncateStringAtWhitespace('trying a thing', 10); // 'trying...' truncateStringAtWhitespace('javascripting', 10); // 'javascr...'

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