JavaScript Function Invocation - Function Invotation

javascript-func-invoke-func.js

// this refers to the global object (a mistake in the language design)
obj.quadruple = function () {
  var that = this;  // common idiomatic workaround for preserving context
  var helper1 = function () {
    that.value = that.value * 2;
  };
  var helper2 = function () {
    this.value = this.value * 2;
  };
  helper1();
  helper2.call(this); // Alternatively, bind this when invoking
}