JS Circular Buffer

Circular_Buffer.js

function make_CRS_Buffer(size) {
  //based on https://stackoverflow.com/a/60285222/1997873
  return {
    arr: [],
    arr_i: 0,
    arr_size: size,
    size: function () {
      return this.arr.length;
    },
    full: function () {
      return this.arr.length == this.arr_size;
    },
    clear: function () {
      this.A = [];
    },
    add: function (value) {
      this.arr[this.arr_i] = value;
      this.arr_i = (this.arr_i + 1) % this.arr_size;
    },
    get: function (i) {
      var mAi = this.arr.length < this.arr_size ? 0 : this.arr_i;
      return this.arr[(mAi + i) % this.arr_size];
    },
    forall: function (callback) {
      var mAi = this.arr.length < this.arr_size ? 0 : this.arr_i;
      for (var i = 0; i < this.arr.length; i++) {
        callback(this.arr[(mAi + i) % this.arr_size]);
      }
    },
  };
}