The code above prints 5.
The trick of this question is that in the IIFE there are two assignments but the variable a is declared using the keyword var. What this means is that a is a local variable of the function. On the contrary, b is assigned to the global scope.
The other trick of this question is that it doesn’t use strict mode ('use strict';) inside the function. If strict mode was enabled, the code would raise the error Uncaught ReferenceError: b is not defined
. Remember that strict mode requires you to explicitly reference to the global scope if this was the intended behavior. So, you should write:
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(function() { 'use strict'; var a = window.b = 5;})();console.log(b); |