Function Scope in JS

Functions in Javascript run in the scope they are defined, not in the scope they are executed.

var baz;
(function() {
  baz = function() {
    return foo * bar;
  };
  var foo = 20;
  var bar = 2;
})();

console.error(baz());

//output: 40

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Comments

[Jon Randy 🎖️]

Not 100% true. If you create a function using the new Function(...) syntax (which is rare and unusual) - they are actually attached to the global scope, and not the scope in which they were defined.