Fixed size / length array (LiFo) for infinite pushing

FixedSizeArrayLiFo.js

//Warning: fixed size is only kept for .push() method
//Usage:
//let arr = new FixedSizeArrayLifo(2)
//arr.push(123); ...
 
class FixedSizeArrayLiFo extends Array {
    constructor(size) {
        super()
        this.#size = size
    }
    #size
    push(value) {
        super.push(value)
        if (this.length > this.#size) {
          this.shift()
        }
        return this.length
    }
}