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55 lines
1.5 KiB
TypeScript
55 lines
1.5 KiB
TypeScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { arrayFastClone, arraySeed } from "./arrays";
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/**
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* An array which is of fixed length and accepts rolling values. Values will
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* be inserted on the left, falling off the right.
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*/
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export class FixedRollingArray<T> {
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private samples: T[] = [];
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/**
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* Creates a new fixed rolling array.
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* @param width The width of the array.
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* @param padValue The value to seed the array with.
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*/
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constructor(private width: number, padValue: T) {
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this.samples = arraySeed(padValue, this.width);
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}
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/**
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* The array, as a fixed length.
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*/
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public get value(): T[] {
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return this.samples;
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}
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/**
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* Pushes a value to the array.
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* @param value The value to push.
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*/
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public pushValue(value: T) {
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let swap = arrayFastClone(this.samples);
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swap.splice(0, 0, value);
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if (swap.length > this.width) {
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swap = swap.slice(0, this.width);
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}
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this.samples = swap;
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}
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}
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