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In JavaScript semicolons is an optional statement separator.
But this can lead to some ambiguities and here is an example of ambiguous code that breaks in the absence of a semicolon :


// define a function
var fn = function () {
  //...
} // semicolon missing at this line

// then execute some code inside a closure
(function () {
  //...
})();


This will be interpreted as:
var fn = function () {
  //...
}(function () {
  //...
})();



We end up passing the second function as an argument to the first function and then trying to call the result of the first function call as a function.
The second function will fail with a "... is not a function" error at runtime.