matrix-react-sdk/lib/utils/FixedRollingArray.js

SDK for matrix.org using React

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.FixedRollingArray = void 0;
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _arrays = require("./arrays");
/*
Copyright 2024 New Vector Ltd.
Copyright 2021 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

/**
 * An array which is of fixed length and accepts rolling values. Values will
 * be inserted on the left, falling off the right.
 */
class FixedRollingArray {
  /**
   * Creates a new fixed rolling array.
   * @param width The width of the array.
   * @param padValue The value to seed the array with.
   */
  constructor(width, padValue) {
    (0, _defineProperty2.default)(this, "samples", []);
    this.width = width;
    this.samples = (0, _arrays.arraySeed)(padValue, this.width);
  }

  /**
   * The array, as a fixed length.
   */
  get value() {
    return this.samples;
  }

  /**
   * Pushes a value to the array.
   * @param value The value to push.
   */
  pushValue(value) {
    let swap = (0, _arrays.arrayFastClone)(this.samples);
    swap.splice(0, 0, value);
    if (swap.length > this.width) {
      swap = swap.slice(0, this.width);
    }
    this.samples = swap;
  }
}
exports.FixedRollingArray = FixedRollingArray;
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