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The Function.prototype.bind() method lets you establish a fixed this context for all subsequent calls — bypassing problems where it’s unclear what this will be, depending on the context from which your function was called. Note, however, that you’ll need to keep a reference to the listener around so you can remove it later.

class Something {
  name = "Something Good";
  constructor(element) {
    // bind causes a fixed `this` context to be assigned to `onclick2`
    this.onclick2 = this.onclick2.bind(this);
    element.addEventListener("click", this.onclick1, false);
    element.addEventListener("click", this.onclick2, false); // Trick
  onclick1(event) {
    console.log(; // undefined, as `this` is the element
  onclick2(event) {
    console.log(; // 'Something Good', as `this` is bound to the Something instance

const s = new Something(document.body);