gfmio/example-calculator

import add from './add';
import div from './div';
import ln from './ln';
import mod from './mod';
import mul from './mul';
import sub from './sub';

/** A simple stateful calculator */
export default class Calculator {
  protected current = 0;

  constructor(initial = 0) {
    this.current = initial;
  }

  public value() {
    return this.current;
  }

  public clear() {
    this.current = 0;
    return this;
  }

  public add(n: number) {
    this.current = add(this.current, n);
    return this;
  }

  public sub(n: number) {
    this.current = sub(this.current, n);
    return this;
  }

  public mul(n: number) {
    this.current = mul(this.current, n);
    return this;
  }

  public div(n: number) {
    this.current = div(this.current, n);
    return this;
  }

  public mod(n: number) {
    this.current = mod(this.current, n);
    return this;
  }

  public exp() {
    this.current = Math.exp(this.current);
    return this;
  }

  public ln() {
    this.current = ln(this.current);
    return this;
  }

  public sin() {
    this.current = Math.sin(this.current);
    return this;
  }

  public cos() {
    this.current = Math.cos(this.current);
    return this;
  }

  public tan() {
    this.current = Math.tan(this.current);
    return this;
  }

  public inverse() {
    this.current = div(1, this.current);
    return this;
  }

  public sinh() {
    this.current = Math.sinh(this.current);
    return this;
  }

  public cosh() {
    this.current = Math.cosh(this.current);
    return this;
  }

  public tanh() {
    this.current = Math.tanh(this.current);
    return this;
  }

  public asin() {
    this.current = Math.asin(this.current);
    return this;
  }
}