CircularBuffer

import { CircularBuffer } from 'mthb-circular-buffer';

Allow OverFlow = true

var circularBuffer = new CircularBuffer(2 /*length*/, true /*allowOverFlow*/);
circularBuffer.push(1);
circularBuffer.push(2);
console.log(circularBuffer.size()); // 2
circularBuffer.push(3);
console.log(circularBuffer.size()); // 2
console.log(circularBuffer.pop());  // 2
console.log(circularBuffer.pop());  // 3
console.log(circularBuffer.size()); // 0

Allow OverFlow = false

var circularBuffer = new CircularBuffer(2 /*length*/, false /*allowOverFlow*/);
circularBuffer.push(1);
circularBuffer.push(2);
console.log(circularBuffer.pop()); // 1
console.log(circularBuffer.pop()); // 2
circularBuffer.push(3);
circularBuffer.push(4);
circularBuffer.push(5); // throw "overflow"

Description and Big O