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

The iterable toolbox

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

const {
  CircularBuffer,
  ReadOnlyCircularBuffer
} = require('../../internal/circular-buffer.js');

async function* __asyncWindow(source, size) {
  const buffer = new CircularBuffer(size);
  const bufferReadProxy = new ReadOnlyCircularBuffer(buffer);

  for await (const value of source) {
    buffer.push(value);

    if (buffer.isFull()) {
      yield bufferReadProxy;
    }
  }
}

exports.__asyncWindow = __asyncWindow;
const asyncWindow = /*#__PURE__*/asyncIterableCurry(__asyncWindow, {
  validateArgs(args) {
    if (typeof args[1] !== 'number') {
      throw new Error(`${'asyncWindow'} must be passed a numeric size`);
    }
  }

});
exports.asyncWindow = asyncWindow;