string-left-right

Looks up the first non-whitespace character to the left/right of a given index

No 3rd party dependencies. All dependencies, checked recursively, are Codsen packages.

Install

This package is pure ESM. If you're not ready yet, install an older version of this program, 4.1.0 (npm i string-left-right@4.1.0).

npm i string-left-right

Quick Take

import { strict as assert } from "node:assert";

import {
  chompLeft,
  chompRight,
  left,
  leftSeq,
  leftStopAtNewLines,
  right,
  rightSeq,
  rightStopAtNewLines,
} from "string-left-right";

// get the closest non-whitespace character to the left of "d" (which itself
// is at string index 6)
const str = "abc   def";
//             |   |
//           012345678

assert.equal(
  `next non-whitespace character to the left of ${str[6]} (index 6) is ${
    str[left(str, 6)]
  } (index ${left(str, 6)})`,
  "next non-whitespace character to the left of d (index 6) is c (index 2)",
);

Documentation

Please visit codsen.com for a full description of the API. For Changelog, see raw md on GitHub or the website.

Contributing

To report bugs or request features or assistance, raise an issue on GitHub.

Licence

MIT License

Copyright 2010-2026 Roy Revelt and other contributors