js-dynamic-this.js

/**
 * JavaScript dynamic `this` value.
 */

function produce() {
  console.log(this.x);
}

const alpha = {produce, x: 1};
const beta  = {produce, x: 2};
const gamma = {produce, x: 3};

console.log(
  alpha.produce(), // 1
  beta.produce(),  // 2
  gamma.produce(), // 3
);