avoid-reverse

Avoid reversing the array and running a method on it if there is an equivalent of the method operating on the array from the other end.

There are two operations with such equivalents: reduce with reduceRight.

This rule is auto fixable.

Examples

Code that triggers this rule:

const string = array.reverse().reduce((p, c) => p + c, '');

const reverseString = array.reverse().reduceRight((p, c) => p + c, '');

Code that doesn't trigger this rule:

const reverseString = array.reduce((p, c) => p + c, '');

const string = array.reduceRight((p, c) => p + c, '');

const reverseArray = array.reverse();

const reverseMap = array.reverse().map((r) => r + 1);

Using the rule

To use this rule, your eslint.config.js should at least contain the following:

import arrayFunc from "eslint-plugin-array-func";

export default [
  {
    plugins: {
      "array-func": arrayFunc
    },
    rules: {
      "array-func/avoid-reverse": "error"
    }
  }
];