iter-tools-es/impls/$equal/async-equal.js

The iterable toolbox

const {
  asyncIterableCurry
} = require('../../internal/async-iterable.js');

const {
  __asyncZipAll
} = require('../$zip-all/async-zip-all.js');

const {
  __sliceFromStart
} = require('../$slice/slice.js');

const none = Symbol('none');
const zipAllConfig = {
  filler: none
};

async function __asyncEqual(iterables, same = Object.is) {
  if (iterables.length <= 1) return true;

  for await (const stepValues of __asyncZipAll(iterables, zipAllConfig)) {
    const firstValue = stepValues[0];

    for (const value of __sliceFromStart(stepValues, 1)) {
      if (!same(value, firstValue)) return false;
    }
  }

  return true;
}

exports.__asyncEqual = __asyncEqual;
const asyncEqual = /*#__PURE__*/asyncIterableCurry(__asyncEqual, {
  minArgs: 0,
  maxArgs: 1,
  variadic: true,
  reduces: true
});
exports.asyncEqual = asyncEqual;